Yes, but the misunderstanding I'm trying to point out is that Mr Beast is not trying to create something of value, they're trying to create something that works well on a specific platform.
In the Bevy analogy, that would be creating a GitHub project that gets the most stars, regardless of how useful or well the engine itself is working.
I'm instead saying the same thing as you, they should continue focusing on building the greatest engine, regardless of the platform for hosting the project.
If Bevy were to follow Mr Beasts advice, they'd focus on flashy demos, engaging READMEs and so on, to increase the success on the platform itself, instead of focusing on the engine itself, which from following their direction almost since inception, they're doing a pretty good job with already.
That sounds awful if applied to Bevy, and seems you misunderstand what "Mr. Beast" is trying to say.
They're not saying make the best game engine, but make the game engine that would do best by GitHub-popular metrics, which is absolutely the wrong way to go.
I hope they continue to simply make the best game engine available, as before, and ignore useful metrics or focusing on where it's hosted.