[...] there is no harm to you, the exchanges do this to prevent money laundering and to prevent scams so do not worry at all and submit documents [...]
That's potentially harmful advice to give, IMO. As pointed out earlier in this thread, there are very serious risks associated with sharing PII (see Why KYC is extremely dangerous – and useless).[...] or you can deal on centralized platforms such as Bisq.Network [...]
I think you mean decentralized platforms. Bisq is great and that's a fine suggestion! 