IntelliJ you buy and you keep what you buy. That's it. You can pay each year to buy the "latest" version, with a price decrease every year until the 3rd year.

You can use the version you buy forever.

IntelliJ is still getting worse regardless of their subscription plan (and it is getting more expensive).

I think it took the wrong turn around a year ago at the same they changed the splash screen (that is why I remember it), after that the updates have been worse.

So you can just stop paying and use the version you like forever.

Done. Everything else is meaningless.