I can tell you that the SSPX recently upgraded its Accounting practices to be much more centralized.
Every chapel uses the same software, the same procedures, etc. Every week all information is uploaded to the Hive.
The Hive knows all details about all chapels, in near real-time. Bishop Fellay, IF HE WANTED TO, could rig a device to his computer that would ring a bell and flash a red light if any chapel's income dipped by more than 5% on a given Sunday. You can see how this could be useful.
Why did the SSPX suddenly want to be so "corporation-like" when it comes to accounting? The old system was good enough for decades. But everything is professional and centralized now, as of only a few years ago.
And this much I know first-hand.
I got to read the new "rules" and detailed procedural changes from SSPX headquarters. They decided to stop trusting anyone, and started requiring 3 un-related people to count the money, they mandated when it would be deposited, they started using special "tamper-proof" bags for the money, etc.
They wouldn't care if the person counting the money founded the chapel in question 30 years ago with their own life savings. No more trust. Everything by the book.
The SSPX has grown too big. They have become a large, international greedy corporation. They have lost it.