They are only taking action because they have an easy target they can score some political points on and who won't fight back
A theory recently occurred to me that I think is part of the explanation:
The rise of blogs and sites like Youtube gave independent journalists reach. Independents vastly outnumber people working in mainstream media. Yet mainstream media has more resources, more access to experts and higher production values.
So how can some rando with a webcam convince the public to watch them instead of watching 60 Minutes or reading the NYT? They can do it with the 'elites' narrative: 'Read my blog because the MSM is a tool of the elites and they only tell lies!'
And soon enough the only mainstream journalists the internet trusts are the ones who demagogue like Glen Greenwald or Tucker Carlson.
But as to the actual comment to which I am replying: it seems like the 'retail investors' who lost money on this WSB thing are suggestible marks. They enriched the kind of 'elite' they hate so much because they believed what they read on Reddit.
So it's probably good, in future, if someone treats them as children and protects them from themselves.
Why? Because they ticked the "I'm an experienced options trader" box? This guy did, but clearly didn't understand how options worked.