That's just how money works, though: the more you have, the more you can amplify your speech. The "media" (including social media) is really just a group of people with a lot of money who use it to selectively amplify messages.

To that end, I think your position is contradictory. If X group has a moral right to use their money to promote speech via ads, why shouldn't media owners have the same right to use their money to promote speech via their platforms?