Yes, that's correct. Startpage is the default search partner, and their search ads aren't blocked by default. Users can enable blocking on that page too with a single toggle in settings. That's why I laid it all out in this post, to let users know - it's about keeping Waterfox sustainable (paying bills, putting food on the table) as it's my only source of income currently.

I've mentioned in another comment, that I've tried other ways such as with subscription paid services, but unfortunately there's nowhere near enough traction for it to be sustainable.

Also bare in mind Waterfox currently comes with nothing, so this is just an extra layer of protection.