Oh yeah, been using their Photography Suite, ie Photoshop & Lightroom and got that email as I apparently didn't upgrade them soon enough. What's particularly perturbing, is the fact that they don't tell you anywhere in the actual creative cloud app that what you're using shouldn't be used anymore. Rather, they send you an alarming email that makes it sound like you did something very wrong
What's worse is that in certain cases, there might be several versions available. Lightroom for example has both Lightroom Classic and Lightroom available if that's on your plan, but no notice of what is particularly safe. I just updated my version of Lightroom to the latest version of Lightroom Classic, yet I still don't know if that's what they want, or if they want me to just update to Lightroom. The notice is very vague and confusingly worded, and the version numbers don't accurately correspond to the product names. This is why it's very confusing to have both internal names w/ version numbers and generalized product names. I think they could have done a much more effective way of communicating this while limiting panic.
I'd add a pop-up message to the app that says the versions one is using are no longer supported and that you're now being updated to the latest versions.
Normally litigation of this sort of hits future sales of products going forward rather than versions that have already been sold though it might cost the company because they'd have to pay royalties/penalties to cover the units that have already been sold that breached patents or whatever.
Unless it's a subscription system? I don't see how people who've already purchased the product can affected.
If Adobe isn't offering the upgrades for free, one could almost wonder if they're trying to scare people into upgrading and boasting the revenue.