It’s going to piss off users and people trying to find Reddit info via Google. It will actively do the opposite of encouraging users to switch to Lemmy or something else because they won’t want to migrate over to a den of assholes. Just delete the comments.

The biggest issue though is that you’ll give Reddit an excuse to revert your comments. Unless you’re in Europe, it’s their data not yours. Reverting deleted comments makes them look bad to existing users, reverting or wiping out cesspool comments will give them actual justification.