Is this really going to be a storage problem? I can imagine only a fraction of the posts gets edited many times.
Like ABCbits said, it can be used as a DoS by spamming my bot with a bunch of rescrapes for long posts.
Well, not necessarily, you can create validation captchas, and create other tools to control this.
Of course, it would be practically impossible to automatically get all the editions, but it could help to create a broader registry.
I ask, just as the bot detects when there are new posts, isn't it possible to have a bot that detects edits? I know these are different things, but the forum, after an edit, leaves a record in the post that it was edited. Isn't it possible to check this information?