In all of these cases the real problem is that the US Government is unwilling to enforce the monopoly rules and/or there is a company who has become too big and

In all of these cases the real problem is that the US Government is unwilling to enforce the monopoly rules and/or there is a company who has become too big and is now the only source of information. If alternative app stores were more popular (and useable at all on Apple devices) then Apple would not be able to unilaterally ban something. I am not defending Parler specifically here at all - that place is a dumpster fire.