Yes, Big Social has more than enough money and tech to upset the Fediverse.
What they don't have is the capacity to onboard knowledge about the Fediverse quickly and easily.
This is because the actual inner workings of the Fediverse are held by only a small handful of people.
Believe it or not, most people who work at Big Social are *not* social media nerds, and have zero interest in how the technology works.
When they look at Mastodon, their response is pretty much the same as everyone else's: they throw up their hands and say, "This is too complicated!"
And then they close their browser tab.