They are forced to stay in the cult through coercion. Members join willingly, and the cult slowly isolates them, encourages to shut out family and friends, takes all their money and makes them financially helpless. By the time they realize what's going on, they have no safe way to leave the cult. That leaves the members vulnerable to all sorts of abuse. That's why joining a cult should be seen as a problem, and not just as someone's preference.
That's not why. See the article. Google has stated this is because amazon doesn't sell certain google products through their store, and doesn't allow prime video on the chromecast.
Regulatory decisions are supposed to be made with public input. We're all aware that the agencies often ignore input. That doesn't mean it's ok to make fake input. The FCC will use these fake comments to create the illusion that the public has given them a mandate. That's unacceptable.