When you trade and put your coins up for sale at a certain price. Who buys your coins? This question is directed at you. If you answer the question, you will know who will burn the coins.

Who can burn the currency $BOB

Anyone who owns BOB tokens in their personal wallet
because burning is usually done by sending the token to the burn address (like:

0x000000000000000000000000000000000000dEaD),
any holder of the token can burn their own tokens.

No one else can burn from other accounts
If you do not own the token in your wallet, you cannot burn it from someone else's wallet or directly from the market.

There is no contract owner who can enforce burning
because the ownership of the BOB contract has been renounced (Ownership Renounced),
therefore there is no person or team that can modify the contract to burn the token or enforce an automatic burn.

Summary:

Burning is only available to those who own the token, and no one can burn someone else's tokens or control the burn apart from that.
There is no automatic burn mechanism embedded in the BOB contract.