Sure, this was clear to me too. My question was not so much about the advantages of browser games but rather if they actually have a market.
And speaking of that: what are the main monetization schemes? Are browser games sold like other games? Or are they mostly ad-based like other web content?
As one data point: https://itch.io/games currently lists 729397 games, 844 of which are tagged HTML5. It's nonzero but I guess it's not that big. But https://itch.io/games/html5 lists 301816, I am not sure how to reconcile these numbers.
Some of those are accepting donations, but I can't tell if they are profitable.
Depends on the nature of the game though. It works best for games that are lightweight and stateless.