I just launched my new site GAME.WTF, a portal that lists the best .io and multiplayer browser games.
I think the website is a pretty good start (let me know what you think), it's 100% custom code and developed from scratch, aimed to be fast, simple and user friendly.
The site is a week old so the traffic is still low and I am currently thinking about ways to bring more traffic.
One idea that came to my mind is sponsoring games, but my budget is pretty low, so I was thinking I could offer my knowledge and time instead of $, I've been a web developer for more than 10 years so I'm sure I could bring something to your HTML5 game.
So basically, I am looking for partners, if you are a .io or multiplayer game developer, we could team up and I'm sure we could both benefit from a partnership.
Whether if it's to create games from the ground, edit an existing game, sponsor a game, etc. I am open to everything, just send me a PM and I'm sure we can work something out.