I like what Jetbrains did: "after you pay a yearly subscription, the version that was current at that point will never expire for you." This means you can just

I like what Jetbrains did: "after you pay a yearly subscription, the version that was current at that point will never expire for you." This means you can just pay once and keep using that version forever, without further ado or mucking about with licensing servers - but you do get some discounts for renewing the subscription and using the current version. OTOH, "now you pay forever or we pull the plug" is toxic: I do have some rather niche programs for which I have legitimately purchased licenses (and would even like to renew them) - but noooo: the maker went out of business, therefore their tools stopped working. What sort of backwards world is that?