google is using their power to prevent others from competing.
the problem here is of course that if reddit would be in financial trouble (i don't know if they are but let's imagine they need this money), they'd be between a rock and a hard place.
google should not be allowed to make exclusive deals, and reddit could not survive without the deal, then what would be left? google buys reddit, or the relevant authority approves of the deal?
i thought about the same problem with firefox. let's assume firefox is forced to allow people to make a choice of the default search engine (just like microsoft was forced to allow a choice of default browser on windows) then google might stop paying mozilla, and they could end up in financial trouble.
ideally no company ever depends on a single other company that much, but that only works if we don't allow companies to grow that much in the first place.