Roblox has made repeated statements on this, latest from their Roblox Developer Con 2020.

In short, not enough demand that requires more support for players.

There has been repeated demands for this but every year is a no.

Here is one of those threads https://devforum.roblox.com/t/proper-support-for-the-linux-p...

ChromeOS works because it uses the Android version of Roblox.