As the one that added that, thanks for mentioning it, but in this age its sadly getting a bit dated. Many consumer routers now disable it by default.

Prefer either dedicated servers/relay servers/STUN/TURN/NAT hole punching.

I don't think I have the data to say one way or the other. I think overall, our current IP laws and DRM do more harm than good for society (not necessarily companies) however.

"Locks are to keep the honest men out", and all that. And yet we try to invent and build strong locks.

Would Witcher 3 have sold more copies if it released with DRM? Would Minecraft ever have become so big if there was no easy sharing and modding?

Yes. No. Maybe."Is DRM useful or futile?" is seemingly an ongoing discussion (in both business and society) for a reason. How hard it needs to be to circumvent also, if less so. Consider having any DRM at all already changes legal implications in a lot of jurisdictions, regardless how bad.

I guess game streaming would be the one way to solve it. Would be hell for other freedoms though.

Yeah, that is the gist of it and why piracy isn't solved. And that problem never goes away. It's just a question of how many layers of obfuscation you are willing to add (and the opposition is willing to undo). All other measures out there face the same. (Not being FOSS buys a bit more time.)