If I win big on Crazy Time (like a 500x multiplier), will they actually pay out? I am worried about scam sites in BD.

That is a valid concern, but banger crazy time is a legitimate platform. I have seen many players in our local community groups post screenshots of their withdrawals. Since they operate with BDT (Bangladeshi Taka), you don't lose money on currency conversion fees.

I usually withdraw small amounts regularly rather than waiting for one huge amount, and it works perfectly.