Not having robots.txt just results in Google defaulting to their reasonable crawl settings. For most sites, a hastily configured robots.txt usually results in problems rather than SEO help.

The indexed pages are also missing most of the 'important' landing pages and other big pages, so most likely some sort of automated spam detection was triggered.

My ISP seems to time out on the domain, sshing and curling from various servers returns the page.

Just saying, the absence of `robots.txt` can be sign of not really caring about SEO.

Not sure about SEO otherwise how would SANA be the top result for Bing, DuckDuckGo, Yandex and... (cue drumroll) Lycos!

I'm not sure either. But generally search engines have very different ranking, I was using Google, Yandex and DDG - and they often have completely different output with Google much better generally, but often having not the sites which in Yandex etc etc