I see you didn't address the part where I tried to illustrate in how demanding multiplayer to be "DRM-free" could be similar to wanting that the developers would desing their next sequal to have totally different game mechanics.

If a DRM-free genie would grant me three wishes, with the condition that each wish can only affect one game instead of the usual "grant me more wishes" or "make everyting past, present and in the future DRM-free" stuff, and lets pretend that I would actually care about multiplayer gaming enough to wish one or more multiplayer games to be DRM-free, even then the I wouldn't be confortable at spending a wish on almost any upcoming game with multiplayer support because I could essentially be responsible at changing entirely the direction and scope of that game.

I said almost, because although I never really had any real confidence that the promised private servers for Star Citizen would become a reality, it was a promise and I would hate see it be broken, especially because first on the list of already released multiplayer games I might wish to become DRM-free is Elite: Dangerous as I was one of the backers who almost had to drag Braben into court to get our refunds.

But aside form those two examples, I wouldn't be making any wishes on any multiplayer game that doesn't already run almost totally on our computers like Minecraft as wishing that a MMO game would have "DRM-free multiplayer" would either remove the first "M" from it entirely or I would need to own a small server farm and multigigabit data connection to be able to host it on my own, then get enough players to join that the world wouldn't feel so empty and at that point I would also have start worrying about things like GDPR.

Just in case you are fine with the first outcome, you would still need to remember to specify very clearly what kind of gameplay the non-massive multiplayer would need to have in order to that wish resulting in a game at least you would like to play, otherwise your wish could be totally wasted unless you consider any change that displeases those "pesky MMO gamers" as a worthy secondary goal.

TL;DR, The problem with defining "DRM-free multiplayer" is that it inherently sets restrictions on the design, whereas with the single player side the developers are free to set their design plans for their game however they please and then proceed to develop it with or without injecting DRM along the way or slap it in at the very last minute before release. And as I feel that many would easily overlook that distiction, I wouldn't start a petition in favor of DRM-free multiplayer without making it a bit more clear what that really means unless I wanted to do a variation of the "DHMO should be banned" parody.