Interested in seeing what happens with yep.com. It's an independent search engine from ahrefs.com based on their own very competitive crawling / indexing instead of being a wrapper around Google/Bing like DuckDuckGo. Ahrefs has very good crawling.
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Google is aware of 90K external links to grapheneos.org compared to 15K for Bing and 38K for Ahrefs. They aren't quite as good at crawling as Google but they're far better than Bing. They do have a long way to go on improving their heavily backlink-based search ranking.