The issue the video is presenting is that they are predatory to kids. Kids don't always have the skills/knowledge yet to know how they are being exploited, which is what these videos are discussing.

There are 100s of ways to be creative in game development outside of roblox that are approachable these days. Itch.io is a simple/open publishing platform. There are plenty of free/cheap game engines. Tons of tutorials on youtube for those platforms.

Those other systems aren't by default setup to lie that you will be the next rockstar developer, just as long as you pump more money into our closed ecosystem for more prominent placement on this front page, while skimming significant rev shares off the top that is opaque.

If roblox is your spark that gets you to think about what is possible, awesome, but those videos describe a corporate structure that uses fake currency, a closed ecosystem, and predatory tactics, to take your talent and make it their content.