How anonymous is a Bisq trade

Fair point, that’s why there are a lot of suggestions for “beginner trades”, special trades for small amounts - without security deposit and less risk (+ high premiums) for the seller.

An example would be this thread:

If you don’t have access to an ATM: For now, I’d suggest that you buy on a centralized exchange, send the funds to Wasabi Wallet, CoinJoin them and then you can list your first trade.

Lol and the worst case would be that your friend is in trouble because of your BTC trade + he’ll snitch on you then?