why do some Bitcoiners act contrary to them? Why do they continue to support centralized exchanges, use them, and retain their Bitcoin there?
The question is how do you know that?,
maybe not at all, some of them do not support centralized exchanges and always avoid the KYC.
But sometimes you won't get the hard life, In centralized exchanges you will get it easy, you can easily exchange your assets if the price starts to pump, and exchange also guarantees your asset is not lost if got hacked, Even if it's long and need a time (maybe over 10 years or never?)