I don´t think there may be terms-of-use issues with paid tutorials.
You can offer paid courses for everything and every software. Adobe Software, Unity, Construct 2, etc.
Why should people spend money on paid courses? Thats easy. Because you have lots of different lessons gathered into one course. I have seen loooots of tutorials that were really good, but they annoyed me, because they had many split parts and were not well presented. It either lacked audio, or the voice was recorded via headset with a 6-year old Counterstrike gaming-kiddy as speaker.
On Udemy, you can have it well and nicely collected and you really have different chapters with different lessons. It´s videos with subtitles which you can also download. You can watch, listen and try for yourself. Often the teachers also provide working material. Selfmade lesson summaries, charts, project files and stuff like that. If you have problems, you can post in the course dashboard and you´ll get a reply from the teacher very fast.
There are also lessons added, after you joined.
I did lots of courses on Udemy (also on topics where you could find several free tutorials) and really think that is the best way to learn (besides Video-Trainings in your native language). I used makers since the maker 2003, right now I am learning JavaScript and for the future, I am planning on doing a RPG Maker Udemy course.