And how many modders do 1. publish a map and 2. are capable game makers 3. Commit to remaking said project and finish it
If you think this is common you're delusional.
I am aware of three.
You're stuck thinking about people who remake an entire map or concept like DOTA or AutoChess.
This applies beyond that. Any and all concepts you ever release inside a map, you're signing over legal ammunition to Blizzard.
I can name a handful of game developers who made Warcraft 3 maps, and they have expressively stated that they have seized any and all activities within this community, effective immediately, out of fear of legal compromise.
This goes for absolutely anything creative you may want to do in the future.
Include a few characters from an idea you have for a novel in your map?
That idea now belongs to Blizzard.
Make up a general game concept in your map?
That concept now belongs to Blizzard.
Use custom art in your map?
It belongs to Blizzard, as well as the likeness of any similar art being open to prosecution for appropriation of intellectual property.
Use custom music/sound in your map?
It belongs to Blizzard, and it once again opens you up to being vulnerable when releasing anything even remotely similar.
The important thing to remember, is that there's so many god damn angles one can approach a copyright lawsuit from, that it doesn't even need to logically make sense. Absolutely anything you sign over to Blizzard, can be twisted and turned in such a way, that they could use it as a point of entry for legal prosecution.
And like I said, they don't even need to win the trial, they can literally just drag it out and bleed your dry on legal fees, thereby forcing you into submitting your intellectual property, even if the lawsuit is complete bullshit.
This is a very commonly underestimated issue.
NEVER sign over ANY intellectual property rights to any company, unless you are literally selling out with no intention of ever touching anything related ever again.