FWIW there's powertripping moderation all over the place, but I wouldn't call them a threat.
It's more than just the power tripping, it's the agenda pushing, the misinfo, the denials, the hostility etc. they might want to see the Fediverse grow, but in a Tankie mindset way. They are always quick to bring up how any other non-Tankie instances are "Reddit 2.0" or "just bots" or whatever else.
Any redditor who is turned off by a take they see on Lemmy and stays on reddit as a result is really of zero loss or concern, IMO.
Yeah, I'm 50/50 there, maybe not the best "quality" user out there, but there's also the secondary effects to consider; going back to Reddit and then every time it comes up they reply with a "It's just a bunch of tankies" can damage a reputation
As far as who made Lemmy, Lemmy is just code, there's nothing Tankie about the code, nor is there anything left, right center or galactic. It's non-political, it's got a job "be a reddit-like link aggregator" and that's what it does, it's a tool and nothing more. It's open source so not only is there no "funding against your beliefs" concerns, all the Tankie devs could leave tomorrow and another group of people can just pick up the torch (In fact, there are a couple different Lemmy alternatives going rn, though not on feature parity with Lemmy, are coming along quick)