The problem is that the artist needs an audience to use arts as a means to survive. If there is no audience to pay or exchange goods for the art provided by the artist, the artist cannot use art as a sole means to survive. Like Facebook, Instagram, Youtube, etc. Twitter is just another platform providing a specific type of audience.

Unfortunately, the artist doesn't get to dictate the audience they receive from the platform since they don't control it. In essence, an artist that starts relying on specific platforms for an audience is making a calculated risk that the audience will remain unchanged for the forseeable future.

As for shadowbanning, even if it is a crappy tactic, in the end is just the platform owner(s) shaping their audience to the way they see fit. One can argue that it is just a tactic to go against the artist. The reality is that the owner(s) are looking at how their audience grows and shrinks and are making their own changes to maximise audience growth and, in the case of twitter, advertisement revenue growth.

When someone relies on a service they provide (art) to pay the bills, pay for food, etc. it's devastating when your service loses customers/audience. Life is a constant risk prediction. Attempting to force change on circumstance outside of one's control is high risk of failure and, in my opion, an effort best used in finding better opportunities.