Ive played in a few of these. It’s an absolute blast once you get your settings dialed in and balanced to everyone else. If they’re not, then the player in the smallest game tends to have a lot of downtime.

The only downside is that the participants need to be familiar enough with their chosen game to do a randomizer which means roping in casual players is difficult.

Also, there are a massive number of unsupported games that you can play like this that are not part of the main website. https://multiworld.news/apworlds.html