I like Jetbrains' subscription model. Haven't ever not been on the subscription. It just gives me peace of mind knowing I won't be left out to dry if I need to be off it.
> A perpetual fallback license is a license that allows you to use a specific version of software without an active subscription for it. [0]
There are some details about which version you are eligible for. The spirit is that if you subscribe for ≥ 1 year, you have some version available when you stop paying.
[0]: https://sales.jetbrains.com/hc/en-gb/articles/207240845-What...
HN comments and the original announcement: https://news.ycombinator.com/item?id=10165334
The followup introducing the perpetual fallback license: https://news.ycombinator.com/item?id=10278285