Yeah but in the course of doing so, you'd also have to a non-Google default search. If the hypothesis that Google is not better or indistinguishable from other

Yeah but in the course of doing so, you'd also have to a non-Google default search. If the hypothesis that Google is not better or indistinguishable from other search engines is true, then you'll be fine (or perhaps even better). But if it's not, then your whole business will have a drag force from that arbitrary friction (perhaps overcomable if the other parts of the business are great). If you rise up with Google as the default search and then threaten to switch away when you are big, then your threat won't have teeth because you risk too much inherently by potentially disrupting the experience of your customer base.