That being said: it should be completely up to you which wallet you use... It shouldn't matter if you ran your money trough a string of mixers, coinjoin or privacy-centric coins: as
ข่าวกีฬาออนไลน์
long as they don't have any direct proof the source of the btc is illegal, they should not have blocked your account.

However, i've seen other exchanges doing exactly the same: putting the burden of proof with their clients... Basically saying their clients are guilty untill proven innocent (instead of the other way around). It's either an easy way of scamming their clients or an easy way to force their clients into not using certain wallets or mixing their coins because it would make it harder for them to proof certain funds were obtained illegally.