I had a bit of an epiphany in this matter, which I'm ashamed to admit may be somewhat self-serving. It doesn't apply to the GN site or lessons because they have standard notation, but rather to the "junk tabs" and chord sheets on the interwebz.
In one of my fake books, as well as a sheet I bought and downloaded from a publisher, is Bill Withers' Ain't no Sunshine, which I'm working on. It's standard notation. I can read, but very slowly. Especially the bass staff (it's just 2 steps lower than the treble staff, neat trick, huh?). More than 2 or 3 ledger lines above the treble staff and I need a lifeguard.
But the point is that I think this problem we're experiencing with the MPA and NMPA is going to force a lot of people, like me, who got lazy about reading musical notation and relied too much on tabs (they have their place, e.g. a quick chord visual), to buckle down and get to it. That, I do not think is a bad thing.
Btw, Justin Sandercoe has a message on his site that he removed his tabs under threat of legal action also. I thought his site was domiciled in Australia or England; SaskStrum also removed his Eagles' tabs due to copyright issue, and I believe he is in Canada (the Sask- part gives that away). So it looks like no one anywhere is safe. At least not in any of the former Crown Colonies.
It is difficult to answer when one does not understand the question.