This really sucks, that is rough. When you’re buying from a company like Atlassian you don’t expect this to happen really.
The writing has been on the wall for a while with Opsgenie though. I work at incident.io and loads of our customers have had deprecation/migration warnings for a year or so now, pushing them away from Opsgenie and into different Atlassian products (with no migration plan, sadly).
It’s been great for us as they tend to move to us (we have good migration support for Opsgenie) but confusing to watch from the outside as Atlassian never stopped selling the product even while actively shutting accounts down.