There are a million interesting things you can say about architecture in video games! There are more people that can close their eyes and visualize the exact locations of the plants in Counter-Strike's Office map than there are people who can visualize any other building anywhere in the history of the world, other than their own homes. And it would be really interesting to just talk about the design of levels as spaces for killing in a fair way, as opposed to say, architecting a museum or a school.
As a member of the Positivist school of video game philosophy, I think that the only valid statements about videogames are those that can be reduced to empirical fact.
They're popular, sure. But honestly they don't appeal to many or most gamers.
Sorted by active users:
860,000 - CS:GO
480,000 - DOTA 2
173,000 - Source SDK Base 2013 Multiplayer (Mostly a multiplayer GTA mod)
146,000 - Apex: Legends
130,000 - PubG
112,000 - Rust
93,500 - Destiny 2
88,400 - GTA V
76,000 - Rocket League
67,000 - R6:S
62,000 - Football Manager
Now, its true that in terms of copies sold, competitive multiplayer games are not quite as dominant.
Like Brawl Stars is also super popular, but it isn't exactly a "competitive multiplayer game" like dota. Most people play it casually without a huge care of W/L.