One of those websites reported having problems for a month or so, then having it sorted out all by itself. The author's article on that:

https://www.jessesquires.com/blog/2022/07/25/my-website-disa...

My sites are technically present, but shown only when I search for the exact domain (bikegremlin.com) or the site name (BikeGremlin).

But none of my articles are shown in SERP when I search queries that otherwise get my articles to top-3 on Google.

I've tried submitting URLs for indexing, to see if that will help, now that at least some problems seem to have been fixed. We'll know in a few days... weeks... months if that's helped. :)

So far, articles in my native are back, at least to a degree. But none of my articles in English, even those that used to rank highly (both on Google and Bing/DuckDuckGo etc).

I've used this situation to check which search engines rely on Bing for their results (primitive, unscientific method, but I think it's accurate): https://io.bikegremlin.com/28530/microsoft-bing-serp-gone-ov...

Where can cases like this be reported to DuckDuckGo?