The problems associated with big tech are not a function of their size, per se. It is the misleading, somewhat coordinated, and coercive nature of their actions. They mislead the public about how they operate, and deny many of the actions they are well-documented to engage in. Interestingly, when someone is removed from one platforms, others quickly follow. However, in my opinion, these companies have engaged in anti-competitive behavior in the last year harming the consumer. For instance, Parler, which uses a different moderation model compared to the centralized systems used by other companies, was rapidly removed from Apple's App Store, the equivalent android option, and was eventually removed from the Amazon Web Servers they used to operate. This is clearly anti-competitive conduct that hurts the consumer. Consumers cannot access a social media platform that uses a different moderation product.
If they continue to engage in these actions, I support the efforts to break them up. To be clear, this is not because of the size, but because of their actions. You cannot and should not coordinate with your competitor to remove a newcomer to the market. If Walmart, Homeland, and Aldi coordinated to keep another grocery store from opening in Stillwater, in my opinion, this should be legally actionable.