But for FTX it made 0 sense as they were newbies in the crowded exchange space (est in 2019). Also sbf background story did not seem plausible, but that is a side note.
There were so many exchanges around working well for years.
Binance, Kraken, Coinbase, Bitfinex, Bistamp, Bitpanda (which is quite bad tho, but nevertheless).
Same can be said for circle usdc. They are new and need to catch up and close the big gap to the︀ first mover. It seems quite risky.
All companies where you are not day to day︁ sitting in them are blackboxes and no proof whatsoever is good, neither audit nor prospectus︂ nor xyz.
Only reliable metrics are passing of market tests under duress and adversity. But︃ at the end of the day one deals with black boxes and should act accordingly︄ (e.g. bankroll management).