You see, the chapotraphouse subreddit was big supporters of Bernie Sanders so when he lost the Dem election in 2019 there was chaos there mostly coping and the most upvoted Post in that time became a Picture of Lenin saying "and were did that bring you? Back to me" and the MLs started talking about the failures of electoralism in liberal democracy and radicalising the bernie people
Technically the quote "And where did that bring you? Back to me." is a line Thanos says in Avenger's Endgame. It became a larger meme that then birthed the chapo bit and you know the rest.
Lenin was the man who pushed for the socialists in Russia to rise up in active revolution when nearly all other socialist leaders wanted to collaborate with the bourgeois government. He single-handedly made sure the October Revolution was launched an the USSR was created. He also spent lots of years arguing against other socialists who thought working inside electoral systems was the "right" way to bring about progressive changes.