Even with correctly spelled words, 3 of 5 animated text videos generated had incorrectly spelled words in the animation. I am being charged credits for "junk" essentially. Completely unusable.

I am also facing the same concern and my credit points are getting deducted for the wrong videos created at Adobe. Kindly refund my credit score and fix the bug. 

Hey ​@Andrew Hamel 

It is a known issue that AI struggles with spelling. For videos, I prefer to take the video into 
Adobe Express
How to Add Text to Video in Adobe Express

Adobe Express has a free option. 
Benefits of adding text in Adobe Express

change fonts, resize, recolour, move, and animate are the big benefits. You can come back to your project at any time and change anything.

Cheers
Nate