I think you underestimate how many fans of strong anti-trust enforcement would actually be in favor of breaking up almost every one of those mega-companies that

I think you underestimate how many fans of strong anti-trust enforcement would actually be in favor of breaking up almost every one of those mega-companies that's been vacuuming up competitors through acquisitions for decades. All the examples you mentioned probably have a negative impact on the market (and the public), the ones I'm familiar with definitely do.