You can criticize publicly available work, but it sounded as you were complaining and was demanding changes. Which make sense if you are donating (which I don't know until now and it's not my business), because you would be expecting your money to help the translating with high quality.
But you are right that you can criticize publicly available work! Excatly like I'm free to criticizing your initial comment
I'm not saying that you need to donate to give feedback. My focus have being in how your feedback sounded, let me point where it sounded a little rude:
- "This might sound rude, but if you're going to release the chapters in groups, at least spend the time to proofread what you're releasing."
- "As usual, these chapters are filled with grammatical mistakes that are sometimes quite jarring."
- "How hard is it to run your translation through AI to double check your work if you're not a native English speaker?"
Maybe donating more helps them to have more time to proofreading... There is many variables to take in count.
Your criticism are valid, it's just how it sounded.
Anyway, you made your point how the chapters are filled with grammatical mistakes that are sometimes quite jarring. Wouldn't be possible to come here (in the forum) and comment the errors so they can change? You could use AI as you said.
EDIT: I'm sorry, I have being dragging this conversation for too long. Any translation mistake is good to be mentioned and show how hard you care about it.
I know that my text made many assumptions that it shouldn't (sorry again). I'm barely present in the forums so I don't know why I would judge your comment.