To my knowledge, almost zero games incorporate licenses that actually give any legal space or protection for streaming, it’s almost always a “we 100% have the right to sue you but we probably won’t, we totes promise fr fr” kind of situation.

But for this case in particular, what’s actually happening is that Japan is one of the strictest countries in the world w.r.t. copyright law; I can’t know the laws of every country in the world, but in 90% of jurisdictions the worst you’d expect to happen is the videos get taken down, maybe your channel gets deleted.

Don’t screw around with copyright law in Japan though.