This seems to be extremely expensive and somebody is footing the bill — this immediately raises questions as to how sustainable this is. I'm worried that I can't find the "Pricing" link on the home page.
EDIT: I'm actually OK with paying, I'm just worried whenever I see a service with an expensive (GPT-4 is expensive) backend and no pricing. There is no way that can continue indefinitely.
a) It doesn't exist yet / more data about usage is needed (ad supported vs paid)
b) The price would be too high for most to start depending on this tool, hence this is a trick to crush competition and force users to pay higher price later
c) It's already known that the product is not sustainable
Especially as it keeps the company motives aligned with the users', i.e. providing good search results rather than showing as many ads as possible.