The thing is you can accumulate the same amounts without using a centralized exchange and its the same effort than doing it in centralized exchanges.

Why do you use a less sourvegn way to stack if their are better tools to do it?

In my opinion privacy matters more than accumulation, because the regulatory environment is getting worse day by day and if they ban the self-custody the first targets will be the people that show they are buying and where their bitcoin are.