What is the Max rating you can get to in Lichess

I honestly don't know

There is no cap.

The highest is 3999 because once this guy on lichess.dev called atanwin2020 decided to make his rating go really high and once he got to 3999 he couldn't get any higher.

What I meant was, it's inaccessible because you won't get any rating points after a while.

No you'll always get some rating points, now it may be infinitesimally low, it still is higher than 0.

You know what it might be fun to actually do the maths and calculate the limits given the current rating distribution & perfect play.

I guess that mods will reajust the ratings if for some reason, a player gets a legitimate 4000+ rating but as @bloopy1 said, the highest possible rating right now is 3999. The highest rating ever on lichess (legit) is GM DrNykterstein with a 3355 bullet rating, followed by GM ALireza 2003 (3301) adn GM Penguinim1 (3261)

#2 idk i think you are capping

(pun intended)

can you get less then zero

#8
Nope

Sky is the limit (probably)