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I am not a member there, but I guess this is somewhat similar: https://kolektiva.social/
Maybe todon.eu is also similar
I don’t remember seeing any such instance.
Probably there is any open and live leftist instance there
Fosstodon.org might be of interest
Is this leftist instance ?
More about open source stuff, but have a look at joinmastodon.org, there will probably be leftist instances for you