Not a good thing when it's taken to absurd lengths. See Lina Khan's attempt to block the Within Unlimited acquisition. The problem with the current administration is that there's no good-faith path forwards to get anything done. If you have worked with the FTC recently you'd understand what a hostile clusterfuck it is.
you should really link to something about it that your specifying. Cause it really looks simiar to blocking Microsoft from buying Activision.. A company that makes the hardware trying to buy up all the independant software vendors and have them only make software for their hardware is getting really, really old. I think the only people that would complain are the ones who would directly benefit.
I want it to be taken to absurd lengths. If and/or when the negative ramifications of discouraging mergers/acquisitions even begin to approach the damage that encouraging them has done to our economy and society, and only then, we can consider slowly reducing the pressure against.