The free version of resolve is incredibly generous already. There are no watermarks, and most features are included. The studio version is a once-off cost, and honestly its pretty reasonable. If you're doing really serious scripting, maybe upgrade?
In the mean time, the free version of resolve 21.0.4 will keep working indefinitely.
I'm not doing serious scripting, but that scripting allowed a clever way for open source products to work with Davinci, without them being wholly tied to the Davinci Way of Doing Things(tm), and that allows the app to work standalone, as well as with Davinci's competitors.
It doesn't cost Davinci any more dev time to keep it enabled in the free version as the scripting engine is used throughout the app.
And weird to drop support in an odd point release. Usually when features are Studio-only, you'll get a prompt "hey you've reached the limit of the free abilities". Trying already installed scripts after upgrading just failed silently, which was a pain in my butt to debug.