We've seen the US sanction the ICC, they have the Cloud Act and the Patriot Act. The US has shown both a willingness and a capability to weaponize your tech against you.
It should profoundly worry the world that three companies — whose heads all have frequent dinners at the White House — control virtually every phone, tablet, and computer in the world. If you expand that to data centres and clouds, email addresses, services and software it's far worse.
It should be considered a matter of national defence for basically all nations to ensure digital sovereignty.
(It doesn't matter who is in the White House, my point is it's a massive security nightmare to give this much control to one group)