Even worse, you cannot use a browser from mobile woth cookies deactivated, at least thta's what Instagram claimed the last time I tried accessing it using DDGs browser. I'm sure that overall nbers improved, I stopped bothering that very day. That leaves WhatsApp from Meta's apps, which seems to become Facebook's Excel: The only reason to use anything from that vendor in the first place.
This is frustrating (among other reasons) because Instagram has become much more aggressive in not allowing you to even see their content without logging in. Sometimes you can see the gallery but not an individual posts, sometimes no individual posts, sometimes you can't see anything at all.