@WillLi
right, what I feel like is NASS had at least 3 options for this
1. Suggest to work together with the new translator because their translations was actually pretty good
2. Release your chapters faster than this new translator because the other translations isn't lacking in quality, and yours isn't either. Can't speak for the other readers but I'm not picky, I'll read any kind of scan so I'll just read the one that releases first.
3. drop the series. If you can't deal with someone else taking your job then give it up. You got like 10 other series anyways.
It's not your choice to tell them to stop. You can suggest them to work with you but it's not your series to tell them to do anything. The only reason why this translator uploaded these chapters before you is because you didn't upload for 2 months.
but don't harass other people online, that's just toxic and wrong.