[absolutelyrad]

If you're serious about this question.

The the answer is: a competitor could build their services on top of Facebook. They wouldn't have to start from scratch. Independent client's mean if the one user trusts you with their data, you can provide them a bigger value.

Today you cannot innovate on top of Facebook. Their network effects mean if your service is superior, you need to beat the network effects first.

And Facebook cannot reasonably offer independent access because: Cambridge Analytica.

Independent client's do what they want without Facebook taking a hit on their reputation. No one blames apple for the crimes committed using their phones/computers do they?

[the_french]

I think that building a competitor on top of facebook is against their terms of service. You wouldn't be able to build an 'alternative facebook client', legally at least.