Is there a legal problem. What's the basis for the opinion. What is the precedent.
Let's take a pre-web example: Use of the early Internet was restricted to military, academic and later other institutions. Pre-1993, advertising was generally not permitted.^1 Were those rules legal problems.
1. https://eric.ed.gov/?id=ED350986
"ICANN", a secretive non-profit coporation with some very well-compensated staff, domiciled in the US, supposedly regulates "the Internet", at least in part. But no one can tell us where ICANN's "authority" comes from. Maybe acquiescence. I don't know.
When ICANN started handing out "domain names" in the early 1990s there was a rule that certain obscene strings could not be registered. Was that a legal problem. Later the restriction was inexplicably lifted. At first the registrations were free. Then they were $100. Then they were $50. All apparently arbitrary decision-making accepted without legal challenge. Where do these rules come from. Under what authority are they made. If ICANN had some rule about how websites can use "their" domain names, would that have been a legal problem.
The Internet has all manner of "rules" and "limits". Some may be technical in nature, but some are policy-based, at least in part. And those policies may come from a variety of non-governmental sources, including mysterious ones like ICANN. How can anyone challenge these "rules".
Let's say I want an IPv4 address block, but a "regional registry" says I am not allowed to receive one. How does this registry even have any authority to set rules and tell me I cannot have a block. Who "owns" the rights to network addresses. What legal recourse do I have when I am refused.
Whatever the answer, the fact is that there is an enormous amount of cooperation and acquiescence to restrictions imposed by sui generis "authorities" that goes into creating a single "Internet". And AFAIK these registries and other organisations like ICANN have few if any "legal problems".
Obviously the rulemaking is not only limited to made up "Internet authorities".
For example, Cloudflare can "kick a website off the internet". Cloudflare makes its own rules. The website may continue to publish via Tor or some other option, but the point is that most "rules" of the Internet are not found in any legal system.
Or how about when .org was going to be sold off to a shell company. Public protest stopped the sale. Although ICANN would have us believe they stopped it. Who "owns" .org. What are the rules. Who makes them. Can they be challenged through legal process.
Websites like Facebook and Twitter need the cooperation of many parties to do what they do.
The Internet, including the few mega-websites, operates according to cooperation and compliance with self-appointed "authorities" whose "rules" are generally never subjected to legal analysis.
In the rare cases where such "rules" are legally challenged, the defendants almost invariably settle to keep the novel issues out of the courts and retain their uniquely derived "power".