Financial: can't pay with Monero or cash, can't just buy Privacy Pass tokens instead of generating them from my account. Usability: can't access other features than Search with Privacy Pass, looking for a location doesn't pop a Maps widget, missing useful/cool search widgets from google and ddg (coinflip, rng, minigames, weather), bad Tor Browser integration (requires installing an add-on), bad/missing Mastodon search
But resources are being funneled towards replacing Google the company/stack instead of Google the search engine/app, so it begs the question if search is still really the top priority or not