Knowing that people can abandon their teams in leagues could someone abandon their leagues they created??

what happens to a league if the owner abandoned it ??

If a league owner abandons their league, it acts the same as a normal league -except- if they have turned on the requirement for approving owners, in which case if you're not in it you can't get in it.

In the case that a league goes ownerless and the members want to maintain it, I can transfer the ownership to another user. I'd probably require that the original owner have not logged in for at least a month before removing their ownership of a league.