Is it allowed?

Can you be a Lichess Coach without a FIDE official title??

But then, lichess.org/coach/Kaczoreczek What is this

I guess you can, if you're are a good player and have some experience and expertise in teaching and playing chess.

Although a titled player is preferred

Imho, anyone (be it lower rated players or titled players) should be allowed to coach, because they might know good theories and principles about the game that they themselves aren't able to execute in their own games which prevents them from having a better rating, but that still doesn't mean they can't teach people and make them better players, like, just think of people who coached Magnus, not all of them were able to become World Champions, but they still could help.

Didn't Kasparov coach Magnus.

I think lichess only allows titled players in order to maintain a certain level of trust and guarantee of quality. As all titled players are aslo verified by name.

@CreativeThinking That's true. But I don't think Lichess would allow that. If you'd see most of the preffered/prominent coaches are titled and most of the others are really strong/high rated.

I guess lichess.org only shows prominent coaches. They may not be able to show every coach on lichess.org. You can have a non tilted coach I have a coach that I won several games against.

@DEEPAK_11 Before, Lichess used to allow non-titled players, but after they changed that rule the non-titled coaches were allowed to stay on the site coaching, which is why you might find a few