It was always a tankie den. The Lemmy developers are very openly tankies.
They held their heads relatively low during the whole Reddit exodus, but that's about it.
Yes, it might sound worrisome, but I dont think you are pushing authoritarian ideology by using Lemmy. The code itself is fine. The code is not authoritarian. The server which hosts your account is also not authoritarian.
Lemmy is, right now, the best alternative for a reddit-like platform. It is something created for the users, by the users. By using lemmy, you are not enriching the wallets of the shareholders. By using something like reddit, you provide content and a select few get to buy a new yacht.
Also, plenty of people are contributing code to lemmy. It is no longer just these 2. The code is also Open-Source. Anyone can fork it and create a new version of lemmy, with compatibility with the current version of lemmy. By using lemmy, you are allowing the possibility that, at any time in the future, someone else comes and says "I have some ideas to improve lemmy, let's do this on my own terms", forks it and continues the work without massively spliting the community.
I have openly wondered if now, thanks to the wider adoption outside of the tankosphere, would be a good time for a cornerstone fork to put these concerns to bed. It would be nothing more than a signaling that the proverbial hands have changed, but it would certainly soothe these kinds of concerns.
I don't think comparing communism with fasism, at least when it comes to exterminating ethnic minorities is accurate. this is an opinion shared by academics, including coauthors of "The Black Book of Communism" (the book which claims communism killed 80M-100M people, though the upper end of the range is the one which has more attention. this number is disputed, again also by coauthors)
I could explain why I believe you shouldn't do this in my own words, but I will use the words of Nicolas Werth, one of the three main coauthors who distanced themselves from the book:
Death camps did not exist in the Soviet Union.
and
The more you compare Communism and Nazism, the more the differences are obvious.
Another quote I will give is from Amir Weiner an American historian and associate professor of Soviet history at Stanford University who wrote:
[w]hen Stalin's successors opened the gates of the Gulag, they allowed 3 million inmates to return home. When the Allies liberated the Nazi death camps, they found thousands of human skeletons barely alive awaiting what they knew to be inevitable execution.
My point isn't to say the Soviet Union, or other states which had or have Marxist-Leninist governments are without critique, but that comparing them to the III Reich, at the very least diminishes the crimes committed by Nazis and makes analysis of the aforementioned States more muddy.
Authoritarianism is bad regardless of the ideology behind it and leads to people with reasonable beliefs (communism could help people that capitalism harms) doing unreasonable things (denying active genocides being carried out by governments that have historically been pro-communism because... cognitive dissonance?) like the subject of this post.
I'm not attempting to argue communism is not bad in my comment, I believe this is even more true if you believe communism is bad.
I am strictly saying comparing Nazism and communism does not give a full picture, which is, AFAIK, something that experts in Soviet history, some of which I quoted, agree with.
What I'm trying to say is that comparing the two you risk either reducing the weight of crimes committed by Nazis, which are worse than those committed in any communist state, I hope you'll agree and also risk loosing the detail distinguishing the two.
I would elaborate further, but I want to make this comment shorter to make what I'm saying a bit more accessible.