I didn't check that finally all BTT finishing in a Hot wallet in Binance...but maybe you are right. But they stated in this forum that they will put these 2,000,000 BTT each day for withdrawing...I don't know really what to think.
Anyway I do not keep or buy any BTT and do not have such intention, and the only BTT I have are in "in-app" wallet. If there is some way to withdraw them some happy day - ok, if not - what to do, this is the life I put big hopes on this project, even thought to make servers with high speed networks to gain more BTT, but now maybe will invest these money in Helium miners - it looks more promising project