I was about to make another post on this topic. We need either the ability to add actual custom search engines or at least opera should add more engines.
The very minimum is the big EU-based ones (Qwant, Ecosia, Searx, Startpage, ...); but basically this list is all good, wikipedia and amazon aren't even actual search engines. I can't believe our only alternative to google and microsoft is duck-notsoprivate-duckgo...
Edit: Forgot to add we actually have already ecosia, qwant, and startpage (well and ebay for some weird reason) on android Opera, so "giving revenue" is probably not a thing or they already have a deal with them. Just why.