Review the Creative TOS, Twitch
In your own TOS you allow:
Building construction sets (Lego, Erector sets, Mega Bloks, K'nex, Duplo, etc) or model kits (Warhammer, Gundam, and etc)
You do not, however, allow:
How do you know that the Gundams etc. Will not be used as toys once they are done? How can you be sure they will not be gifted to a family member and that they will use them as toys.
Toy assembly should be allowed.
You do not allow: Unboxing
But yet many people do unboxing streams (primarly "big streamers")
You do not allow: Playing puzzles
But you allow Writing on the same directory.
You allow: Construction, home building and renovation
You do not allow: Assembling furniture or Decorating your house. Do these 2, fall under IRL then? If not, consider allowing those as they should fall under the same category as home building or renovation.
You allow: Licensed Tattooing in a safe, professional environment
You do not allow: Piercings. Why is that, if done in a safe, professional environment, it should be allowed. They usually do this at the tattoo parlor.
You need to review your TOS regarding Creative. You also need to review your IRL TOS. And review your site as a whole. Because the above written "Rules" do not make sense.
As for piercings, I imagine it's because of the blood and how it can be seen as more violent than tattoos. Everything else seems reasonable enough and unless the tos explicitly says that you can't do said things, I don't see any reason not to.
If the tos does explicitly say that you can't, then I can see the point.