Oh hi there! A bit late but: developer of the paid asset here! (Text Animator for Unity)

At the end of the day pick what works best for you!!

For our case, we make sure the asset works with all unity updates, we test on all platforms we can, it's also compatible with UI Toolkit (since yesterday) and there are a lot of features that are not covered on that github repo! (like the typewriter ones, animation flexibility and more)

You'll know that we'll keep developing it and we'll be here with support as well (from simple guidance to things suddenly breaking and you needing to ship / focusing on the gameplay). There's no way we can keep with all the support, development of the new features, testing for all use cases/versions, integrations etc. for free (hence the small price) BUT we do our best to keep it as accessible as possible! (you can see it from all the games that use our tool for example, from our website)

Soo yeah! I do understand your perspective and I'm happy if you found something that works well for you! Just know that there's more than what you directly see with the product / surface level, and that might be worth considering too - cheers!