Tech companies realize they owe a lot to their users. They owe them their entire existence, I'd say. It's quite obvious from their behavior and the fact they try to attract and hoard user attention. Users are valuable in general.
It's not like it's one way transfer of value from companies to users.
Because if YouTube decided to hoard all ad revenue as of tomorrow (putting aside for a minute how bad of a long-term business decision that would be), that would still not be a valid reason to shoot up the HQ.
I'm just saying that YouTube and likes of it would be nothing without producers of content, big and small. It's a mutual relationship. Both owe each other their business.
It's orthogonal question to the effectiveness of going somewhere and shooting some people.
If she were to be working for an employer in an EU country, it would be illegal to just fire him person from a job without compensation.
The situation is different (AFAIK she lives in the US which has far fewer job protection policies, and earning a living through YouTube doesn’t count as an employer-employee relation), but there are analogies. Few countries and jobs have so little job security as being a YouTuber.