[charonn0]

They don't need to be a literal monopoly to be guilty of anti-competitive practices.

[granzymes]

FTC does in fact need to show (directly or through indirect evidence) that Meta has monopoly power in a relevant market and that it abused that power in order to win a Section 2 case.

If the relevant market ends up including TikTok or YouTube, FTC will be unable to make that showing.