Purely my opinion:

Like many hip big startups today, one of their strongest competitive advantage is having users. Most users come because product A offers a better UX than product B.

At least I feel that most big FAANG companies are mostly UX plays. In some cases you have to get very technical and innovative to give a good UX (Google), but in other cases not (Facebook).

Hmm, there's a closed source API that Quirk interacts with. Plus, we still retain ownership over the name and branding.