About the mods... These types of mods has always existed for GTA, some team convert the map to the newest engine, they show a video, fans are in awe, they get their 15 minutes of fame on gaming sites, they might earn some good cash via Patreon etc.
But that's as far as these mods go because you also have to recreate everything else and that's easily 8-10 years of work for a small team, converting the map is the easy part. A team that also will have key people leaving (because life) and usually that's how it just dies eventually. I've seen hundreds of these mod projects for various games and i've been a part of a few too (including one for GTA).
Not saying R* is right to take them down, i despise them and will never support them, but you probably shouldn't hold your breath for any of these mods to ever come out either.