Lichess said that my opponent intentionally lost against me

I played 20 rated games against my friend, @byebyebyebye, who is not very good at chess, and I won 19 of them, and Lichess sent a warning to me saying 'In your game history, you have several games where the opponent clearly has intentionally lost against you. Attempts to artificially manipulate your own or someone else's rating are unacceptable. If this behavior continues to happen, your account will be terminated.' Does it means that if I play more rated games against her and win, my account will be terminated?

@Stephanielo The warning may be of the king of the hill games, since many of them are 4 move games

But @byebyebyebye does not even know how to play King of the Hill, she just wanted to try it so I agreed, and I briefly explained it to her

I would recommend playing casual games then. What's the point of playing rated games when one of the players is just starting to master the game.

Good point #4

@Dagne Sometimes it's used to get that player to a lower level so he can play against lower level players in the lobby (artificial manipulation with good will).

Nonetheless, it's sandbagging one way or the other. And that is explitly forbidden.

@chesseater78 That's not sandbagging, because the other player is not intentionally losing - he's playing to his full strength.

Thanks all!

@Stephanielo Lichess might be think that those two accounts are both yours. If you have two accounts and play yourself, lichess is going to ban you.