I will try to answer these, and hope someone corrects any potential innaccuracy:

what’s red?

There is a comment there saying “see deep-dive for details” so the red-highlight caveat is likely explained there.

what’s the globe icon?

My assumption is that icon just indicates Free/Open-Source projects which have no “owning company” (not “based” anywhere), just globally scattered contributors.

how come some products marked not majority EU owned have the EU flag?

My guess (merely a guess) is that those are run by EU-based companies, but which don’t have a solid policy guaranteeing “majority of shareholders are in the EU” (…?)