roblox is a good suggestion. i know it's often criticised, especially for its profit margins, but developers get a massive potential audience, free unlimited multiplayer hosting, and many monetisation streams with little setup.

the company could definitely do with better PR, and their child safety features are good but not perfect by any means. i'd still say it's a good choice if you're trying to make a game easily and quickly

disclaimer: i've made money from Roblox's DevEx program