[tim333]

>Facebook ... stays big primarily because of network effects

And trying to buy anything that competes. If they'd been blocked from buying Instagram and WhatsApp they'd be in a much weaker position. Antitrust stuff could in principle stop them doing that.

[robryan]

It is kind of working now, I doubt they would be able to buy TikTok. I don’t recall them being involved at all when Trump was trying to force its sale.

But yeah big tech needs to be massive before it comes under any real antitrust scrutiny.