A wise mantra is to not let perfect be the enemy of good.
Those PACs were likely already going to propagandize. It's not like they suddenly become more powerful or concentrated because the state media promoted posts that happened to align with them disappeared.
Also in some instances like foreign influence (e.g. the HK protests and surrounding state ad campaigns from which this policy ostensibly stems), there may not even be a corresponding PAC. So shutting down that advertising could be surprisingly significant.
Those PACs were likely already going to propagandize. It's not like they suddenly become more powerful or concentrated because the state media promoted posts that happened to align with them disappeared.
Also in some instances like foreign influence (e.g. the HK protests and surrounding state ad campaigns from which this policy ostensibly stems), there may not even be a corresponding PAC. So shutting down that advertising could be surprisingly significant.