alt Hacker NewsThe issue is that there are plenty of large companies that are effectively censoring legal views, and making it harder for people to setup alternative platforms that support them. For example, Visa and Mastercard control much of the payment infrastructure used online, and have far stricter rules about the type of content they allow payments for than what many countries actually allow. Same with Paypal to some extent, or Cloudflare, or cloud hosting platforms like AWS.
The problem you're describing isn't so much that private companies are allowed to choose who they do business with, but rather that the US has allowed far too much consolidation of markets to occur.
Regarding your example: I fully agree that Visa and Mastercard have way too much control over payment infrastructure. Before doing anything else, I'd break up their de facto duopoly. I'd focus on Visa in particular, as they control nearly 2/3 the market by themselves.