I agree with that too. And to take the metaphor one step further, which may be to go too far, if someone does not want to have their ideas on the same shelves

I agree with that too. And to take the metaphor one step further, which may be to go too far, if someone does not want to have their ideas on the same shelves as some other ideas, the best is if the marketplace is big enough that there are other shelves to move to. For example, there are more record companies than there are streaming services. The consolidation that seems inevitable in the Internet era works against a truly diversive market. Traditional bookshops worked much better for this. The convenience that many values, to have everything in one place, has disadvantages too.