No, they're mad that any singleplayer content planned for GTA 5 (and RDR2) in the past decade was abandoned for the money printing machine that is GTA Online. There's issues to be had with premium currencies (more specifically the stuff that usually goes along with them like lootboxes), but that's not just a GTA thing.

Also, just because other people created content for a game through mods doesn't mean we should give the company that made the game credit. That's like praising a Bethesda game based on a total overhaul mod somebody made.