That is a damn nice paper, thanks for sharing that! The comparison table is, if a little wacky-looking at first glance, a pretty great overview. I skimmed it for the abstract and conclusion but now I think it's worth reading it in full.
Kinda depends on exactly how much you want it to sync, e.g. should it truly sync all files from the synced volume to all clients, or do you want the files to only sync/download to clients when requested, keeping a "master copy" on a server?
For me, I use Syncthing for a simple setup where I want multiple machines to have a few different shared folders that sync with each other, all files updated on-disk when connected to a network.
For a more Google Drive-style approach with only fetching/syncing files onto client disk when explicitly chosen, I believe Nextcloud has what you need, but I've not used it on any of my own machines. It can be self-hosted or paid for, depending on what you prefer.
Unfortunately there's fertile ground in these circles. Forgive the short novel ahead, this is a part of computing history that I find really interesting and important. TLDR at the end for ya.
Since the very beginning of the F/OSS movement, the kind of philosophies the engineers were comfortable with leaned toward a very individualist, libertarian kind of thinking, though they often identified with anarchy. See crypto-anarchis[m|ts] for example -- they focus on cryptography being a core part of safeguarding people's individual liberties.
On its own, those ideas are generally good, but the context these ideas were fostered in tended to have a higher influence of profit incentives at play, which is naturally at odds with more collectivist/communal goals.
With the prevalence of slightly right-leaning, libertarian thought in early F/OSS circles, you can see the lineage up to 90s-era and modern-day cyber-libertarian thought. The tolerance those philosophies often afforded to positions further "right" of them have allowed influence from technofascists to gain a stronger hold over time. If you haven't read The Nerd Reich by Gil Durán, that's a good resource.
TL;DR: lots of libertarian thought was present since the beginning, which afforded a certain tolerance for more right-wing, authoritarian beliefs that wealthy individuals and other non-government agents tend to align with when they're creating networks of power that essentially replicate the same kinds of fascist conditions that libertarians claim to hate.
Unfortunately, that's also where most "normal" people are online. Sucks that it's become so commonplace for such obviously inhumane viewpoints to be spouted in public forums, it really makes it hard to have trust in other people
Obligatory Worse Is Better by Richard P. Gabriel reference
TL;DR for those unfamiliar: the guy (an important figure in programming/Lisp history) argues with himself for a few decades over what's the better of two different approaches to software development: good-enough but hacky/limited/worse software tends to outcompete more complete/elegant/correct software because it gets to market quicker and makes iterative growth from there. Essential reading for anyone interested in programming history, or just software in general.
Really excited to see progress on this, as a Sync refugee it's the one thing I really miss from the app: the consistency of gestures and overall navigation. Summit is very close, but there are still some hitches. Can't wait to see what comes out of this!
I hadn't heard of silver bullet before, that's a pretty cool find. Have you used it much before? I'm curious about trying it myself but want to know if it's worth investing much energy looking into.