Othe reasons:
- Some developers create a new page for a new release instead of updating their existing page - which is a bad thing to do - but I've seen it happen. Obviously then they lose all the comments and followers.
- They might also accidentally do it - like if they wanted to change to a forum but then changed their minds.
- The game was fully written by AI and the developer cannot implement any changes or fixes because they don't' know how to - so instead they remove the comments.
- The game was stolen or reverse engineered and the developer cannot implement any changes or fixes because they don't know how to - so instead they remove the comments.
- The game was stolen but the developer doesn't want to disable comments because that is suspicious - so they delete the comments.