https://www.jetbrains.com/store/#personal?billing=monthly
https://sales.jetbrains.com/hc/en-gb/articles/207240845-What...
Perpetual fallback license means that if you stop paying for a subscription, you can keep using the version you are on, in perpetuity.
Sounds fairly reasonable. If there are no updates, you would cancel your subscription and use the fallback license until the "rent-seeking" stops.
I remember that the launch of the 2022 versions had a drop in quality, I don't remember when was the last time I had crashes in a Jetbrains product, but with the launch of 2022 versions crashes occurred on a daily basis to the point I really considered cancelling my subscription, and I activated for the first time the option to block updates in Jetbrains Toolbox.
Months later they launched their promotion to keep the current pricing for 3 more years and I renewed. I acknowledge that promotion was a genius move by them, but I'm unsure if that promotion was a result of a drop in income for them.