What behavior was fine, exactly?
The censorship, the injection of government-approved standpoints, the shadow-banning, the organised campaigns to throttle dissenting voices and more similar activities. This all happened under the Biden regime with nary a peep from the media and those who pointed it out were labelled and called names. Then Trump returned and 'Big Tech' just followed along but this time around they're called out for being shills to the orange man.
I should have been more precise. My point was merely that the tone of MSM and left leaning media and commentators took on those same platforms was completely different. So to your point, I agree, it was never fine, but it was only seen as problematic by the mainstream after the re-alignment with the Trump admin.