hahaha!

hahaha!

The horizon always appears perfectly flat 360 degrees around the observer regardless of altitude. All amateur balloon, rocket, plane and drone footage show a completely flat horizon over 20+ miles high. Only NASA and other government "space agencies" show curvature in their fake CGI photos/videos.

The horizon always rises to the eye level of the observer as altitude is gained, so you never have to look down to see it. If Earth were in fact a globe, no matter how large, as you ascended the horizon would stay fixed and the observer / camera would have to tilt looking down further and further to see it.

The natural physics of water is to find and maintain its level. If Earth were a giant sphere tilted, wobbling and hurdling through infinite space then truly flat, consistently level surfaces would not exist here. But since Earth is in fact an extended flat plane, this fundamental physical property of fluids finding and remaining level is consistent with experience and common sense.

Note †: 1 syllable too many.  Best fix to conform to historical "we have to fear" (4 syllables) might be slight editing to " a  Flat-Earthers fear s ".

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The tiny red letters on the left side say: RESEARCH FLAT EARTH.  Maybe you ought to do some research, then.
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Here, I'll do it FOR you.
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Hilltop Ski Area in Anchorage, Alaska, starts at 500 ft. elevation with a VERTICAL DROP of 294 feet coming down to the base. So it goes up to about 800' at the top of the lift, which is the top of the ski slope. This photo could have been taken 300 feet higher up and then they could have pretended that it was taken from only 500 feet high. But I'll let that pass.
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Here is a topographic map of the area. Use Google Earth for additional information such as direction and distance to Denali.
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The detailed topo map identifies Hideaway Lake and Lake 'O' the Hills at the end of Little Campbell Creek (north fork) as 900' el., and the South Campbell Airstrip (a.k.a. BLM airstrip) at 300' el. Hilltop Ski Area has a base halfway between, at approximately 600' el.
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Denali Mountain (el. 20,310') is north-northwest of Hilltop Ski Area, with the Knik Arm as the only body of water in between.
Knik Arm borders Anchorage and covers from 12 to 16 miles north-northwest from Hilltop S.A. Since the nice photo claims a mountain in the distance to be 20,000 ft, it must be Denali (erstwhile Mt. McKinley) that they're referring to. But the photo says "140 MILES AWAY" when Denali peak is only 120 miles from Anchorage, and its base is 100 miles from Anchorage. More errors.
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The big black arrow pointing down on the left side under "140 MILES" its tip is touching the north shore of Knik Arm, which is only 16 miles away from Hilltop Ski Area. No shortage of errors!
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Therefore, you have the hilltop south of Anchorage (which is all built up now with houses) going north-northwest to the far side of Anchorage where it has a shoreline on Knik Arm at 12 miles, covering the bottom half of the photo. Then from the south shore of Knik Arm to the north shore, a distance of 4 miles covered in just 1/4" of the photo, and subsequently the remaining 100 miles (not "140") to the base of Denali only occupies next 3/16".
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In other words, there is an enormous difference between the angle of view (toward the ground) from the hilltop south of Anchorage compared to the angle of view from the same place (toward the horizon) over the north side of Knik Arm to the base of Denali. Even more relevant is the fact that from the hill top to the north shore of Anchorage is DOWNHILL but from the north shore of Knik Arm to Denali is ALL UPHILL. One would expect a photo looking down a hillside to be foreshortened compared to a view facing an uphill slope, if the level basis of all this area were a "flat" earth.
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The camera is facing into the ground in the bottom half, but it's nearly PARALLEL to the ground in the upper half.
Then in the area where the arrow points "190 miles away" (pointing at who-knows-what) there is no ground visible at all.
If the surface were gradually curving downward into the distance, this would make perfect sense.
So the photo supports a spherical earth.
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BTW that "190 miles away" thingy is not a mountain range or anything else visible because there ISN'T any mountain range north of Denali.