I think there is a decent sized market in terms of number of players but monetization is not as good as other platforms. There's no IAP and less inventory of app install ads, which I believe are the big moneymakers for native mobile games.

A common path seems to be early access on the web to build a following, with a release on Steam/app stores for monetization afterward using Electron or Node, with the web version remaining as a free demo (e.g. Vampire Survivors or CrossCode). The other path is ad monetization, and there are a lot of portals like crazygames.com or poki.com that host that type of game. I think the market there is largely schoolkids with Chromebooks. I'm not aware of any successful web games that are sold as an up front purchase like Steam games.