...and all of them will be shit meaning that, in every single case, the user will go looking for another default search engine using the browser extension marketplace or the web or a review website or some other discovery facility that's actually useful. Your 10.000 search engines business would go broke and they would disappear from the list of search engines getting randomly selected from. Making the random list useful again. Behold the power of free market economics. It could only be a long-term equilibrium if it actually delivered something that was in the consumer's best interests, rather than being designed for the purpose of handing the largest-possible pile of cash to Google.