Lemmy is federated, Lemmy.world is more of a "liberal echo-chamber" while an instance like Lemmygrad.ml is going to be more Marxist-Leninist. There's also Hexbear.net, which has Marxists and Anarchists alike in a united anti-Capitalist space. I don't personally agree with the idea that a Communist echo chamber in the West can exist, all Communists in the West exist in a system that overwhelmingly demonizes us at every turn, we can't shut out liberal ideas even if we wanted to. Meanwhile, liberal echo chambers can exist, as liberalism is the status quo.
As for Lenin, I admire him greatly, overall. His analysis of Imperialism, contributions to the National Question, and creation of successful revolutionary strategy are critical to the Marxist Canon. Lenin helped create the world's first Socialist state, itself a tremendously progressive force for its own working class and a liberatory movement globally in areas such as Cuba, Algeria, China, Korea, Angola, Vietnam, Palestine, and more.
He's also a really funny writer, in that he always manages to shit-talk Kautsky for his opportunism, and the ultimate betrayal of the Working Class by Kautsky's Second International.
I wouldn't call Marxists creating our own spaces outside corporate-controlled media like Reddit "wild," it's a natural conclusion. If Marxists are demonized in corporate media and censored, we will create our own spaces where we won't be silenced.