For me personally, I have only have 1 account on lichess. However, I understand the times for exceptions.
Possible exception A, burner account to try new ideas:
One IM mentioned to me a person could make a "burner" account to try new openings and ideas. When I was lower rated and only playing on chess.com (1500-2000 back then) I did that (evans gambit on 1 account, ruy lopez on other one; or sicilian on 1 account, ...e5 on the other). The problem with it was I couldn't always play different openings on those different accounts OR even when I did play a different position there was nothing different in my play. There was no new psychological gain. I eventually just played what I normally do (ruy lopez and ...e5 at the time), and I ended up deleting those accounts anyway because they held no purpose. I just always tried to play the best move and my best chess, different openings or positions did not matter or influence my psychology or play. I didnt gain anything differently than I would from just having 1 main account.
Possible exception B: streaming/youtubing.
An argument could be that you play different chess when streaming since you narrate your thoughts. The purpose of this new account isnt playing your best chess, but instead your best content creation. Will work perhaps to a degree, but for me, again the same issue occurs, I play the same as I am streaming compared to regular online games. Like I am always the same and try to play the best moves and my best chess. Conclusion is that there is no net gain.
Possible exception C: Team Account
The purpose of this could be to have an account solely for your lichess team and lichess team matches. There is an assumption that your will play differently than you would unaffiliated to a certain team. I know many players who have their own main account, and a lichess team account. I have not noticed them playing too differently for the team matches and their own main account's games. Basically they play the same and simply try to play the best moves. Therefore for me personally I do not understand the purpose of these multiple accounts. 🤔 I conclude there is no net gain.
At the end of the day it comes down to playing your best chess. 1 account is efficient for that purpose. these other accounts may psychologically give you new insight into the game, maybe? BUT I think it depends on the person. I always play the same. I dont need a burner account to play more aggressively.
My conclusion is to not have multiple accounts. I think everyone should consult with lichess before they decide to make another account. Also they need to take into account the purpose of this account and if there will be a net gain. I believe there is no advantage to making another account. IF you make another account so you can "relax" or not play the best chess, you are then just going to be reinforcing bad thinking habits and it will make you a worse chess player. It is also considered sandbagging. This is a conclusion from my own experience; there is simply no gain from another account.
Follow the rules. Don't make multiple accounts. 🤓


