That sounds like a very naive view on part of that developer. He probably never heard of Microsoft’s „Embrace, extend, and extinguish“ approach. This is going to be similar with Facebook. They have a lot more resources than all current instances combined and can provide a much better user experience. They are going to be the main instance on the federated network slowly starting to extend it and support features others lack. Making it a unique selling point until it’s too late.

And that’s not even looking at the moral/ethical standpoint of getting involved with Meta.