You're proposing a fiction that there is functionally any difference. Migrating a subreddit is a large community effort and rarely if ever happens over just one ban.

If you're banned from a subreddit for X, which famously happens for often the thinnest of reasonings, you're effectively out of the online community around X. For some subreddits this even has real-world implications. You don't have to be the least bit spicy to do this. Often you just have to have commented (at all) in a different subreddit that a mod doesn't like.