what happened if someone deletes his wallet or closes his account while he has Bitcoin?
where are all these coins go?
i has few ETHs and some BSC and bitcoin and closed my accounts ( no worries all less than 2$ )
what is gonna happen to them ?
Wallets and accounts are different.
You can have an account on an centralized exchange but if they're scammers, they don't credit any bitcoin to your account. Closing your account can be supported by exchange or can not be supported if they change their ToS for example to fulfill with KYC/ AML.
Wallets can be deleted but you can recover your wallets if you have private keys or mnemonic seeds of your wallets. If you did not make any backup, but delete your wallets, you lose your bitcoin forever.
How to back up a seed phrase?