Advertiser friendly platforms would prevent unsavory posts from popping up on their platforms in order to ensure maximum revenue.
The worst thing you can do for free speech is make the platform reliant to advertisers.
Discussion
The "would prevent unsavory posts from popping up on their platforms" issue can happen in leiu of advertising. See nos.social. And yes, there is a target audience for this.
EVERY PLATFORM SHOULD REMAIN EMPOWERED TO REMOVE/HIDE/FILTER/CENSOR CONTENT THAT GOES AGAINST THEIR TERMS OF SERVICE. Nostr as a protocol, with or without advertising does not alter that.
For example, even without ads, Corny Chat does not advertise all rooms.
Freedom of Speech ≠ Freedom of Reach