@AEngelsrud Sure, so in any effective liberal property regime, there is also the rule of law, and property rights are bounded by those laws.
In the USA, for example, that usually means that one can’t deny access to a business service based solely on characteristics of a person that are innate (e.g. civil rights discrimination). Also, there are laws preventing the use of property in a way that harms or promotes harm to other people (pertinent to your example).
The modern problem is not that people don’t have a voice. There are many options to be heard by thousands or more, even for those that have been kicked off of some social media platforms. Our modern problem is manipulation, incitement, falsehood, and lies being delivered at scale, not the inability to find a variety of viewpoints. Precisely because of the power they wield, platform owners have a duty (ethical at least, sometimes legal) to not promote harm. Most have been derelict in this duty, because the network effects have been too important, the profits have been too good, and/or because their model is built around advertising and therefore attention. Yes, it will be hard work to be better stewards.
Pleaese do not project on to me what you believe I may or may not have thought through.