Actually, it was on their Recovery Policy (updated since 2017), not new :
https://bittrex.zendesk.com/hc/en-us/articles/115000961172Aside from Bittrex's notification about the token being delisted, have you informed people via your newsletter or social media accounts about it? If yes, then you and Bittrex did your part. Also, if the users put their coin/token on exchange, they should know the risks.
Only 30 days is way too low, people go on vacations lasting longer than that. It's a clear money grab IMO.