If there's no support and no updates. Can't work with web apps unless there's a version restriction/time limit.
Although it does sort of put pressure on the developers to actually refine their product and continue to deliver tangible improvements. Nobody is going to pay for a UI that's been re-arranged a bit.
I can't think of a single subscription service I use that doesn't continue to deliver new updates and value on a regular basis, and other than Adobe's bullshit "annual masquerading as monthly" drama I haven't come across something I wished was still packaged.