[meowface]

For what it's worth, I agree with the other comments that you should drop this idea and pivot. Not nearly enough people care about this.

My advice is to run some other thing and just - as a gift to yourself and a somewhat silent gift to the world - don't monetize it via advertising or selling user data.

Don't make that one of the selling points of the platform: just do it because you think it'll create a better product that more closely aligns with what provides a good experience for users, and because you think it's more ethical. It's very likely not going to be a significant draw for the product in itself. You can mention it as a bullet point in marketing, but don't make it "the thing".