I was switching from Instagress to MP about a month ago, and found in their terms that they offered refunds on unused time.
But that doesn’t mean I don’t agree with you.
They totally knew they had it coming. They used ‘insta’ in their name, that is step 1 to getting shut down for sure.
EDIT: Who’s to say that Instagress didn’t ship off a big list of users to Instagram