[jack_pp]

Well let's go by https://steamcharts.com/

CS:GO : allows both custom maps and community servers

Dota : allows custom maps, some of which have created and radically changed existing popular games like auto chess did to Hearthstone.

These two games which are in the top 2 have more hours played than the next 8 games in that ranking.

[paczki]

Yeah and it's fantastic that those games still exist and allow things like modding and mapping, however both of those games are a decade old. It does feel somewhat like the trend has died down significantly for newer games, no?

I certainly love them though! I'm still holding out hope for Source 2 SDK and Hammer 2 to actually become a usable tool outside of VR or Dota 2.

Facepunch [0] (Makers of Garry's Mod) are utilizing Source 2 with Valves permission and everything they're working on looks pretty promising, with great potential for a new era of modding.

[0] https://sbox.facepunch.com/news

[grogenaut]

Heck both of those games ARE mods of other games originally... They also both spawned off massive mods and copies themelves. Anyone remember the autochess craze of '18?