This is not my work! Also I’m unsure if this is the right category to post it, but I found it inspiring.
The Babylon.js web FPS game Shell Shockers (https://shellshock.io/) I know has been featured and mentioned before but here’s a recent interview article from GameDiscoverCo with the creators about marketing, audience and financial return:
Very smooth control, comfortable to play and shoot 
A while ago I first heard of Shell Shockers through an amazing HobbyDrama post (https://www.reddit.com/r/HobbyDrama/comments/10oejss/online_gaming_war_is_shell_how_an_online_game/), and today I’m discovering it’s Babylon based! This is such a funny coincidence 
But also a great example case of the advantage of a browser based game over installables (I played my fair share of flash games on computer lab laptops!)