I remember having a deep sense of fear in choosing to give up my digg account, knowing I was going to get banned for posting the AACS key. It was like I was losing a vital part of my identity online.
After a while with my reddit account I felt the same way (it being a vital part of my identity online), but, in recent years I care less and less about the platform. My account is now dead. I just checked and it's almost 2 years since I posted anything.
I have created a few alt accounts which I use for discussing some specific niche things on some niche subreddits which I enjoy, but, the site as a whole has no appeal to me anymore. If I couldn't unsubscribe from the default subs, I would leave the site and never return.
There are some cool communities I enjoy. I spent time (on an alt) in /r/thelastofus discussing the game after I finished playing TLOU2. I spent time on /r/seattle and /r/seattlewa reading about CHAZ/CHOP and events there.
I enjoy HN a lot, but, it's very focused which has an effect of myopia.
When the redesign becomes mandatory and old reddit goes away (and don't kid yourself, it will), I will probably leave and never return, but, unlike digg in 2007 I'm not going to feel like I'm losing anything when I do.