"Control" and ecosystems don't match well.

They're alive! They can be guided but not moved.

Your choice as a company is:

1) a very large, wild garden you don't control, or

2) a very small, tidy thing you have control over.

The garden takes a very long time to grow, which might be longer than the runway you have!

A popular request: "I want to make a YouTube".

This is a large wild garden that one entity has significant control over.

It's an existence proof of an aggregator that grew as a platform.

But it's a distracting black swan; extremely hard to do that from a standstill.

It's best to ignore it as a possibility and instead pick which of the two alternatives are more important to you.