The feature checklist is only a part why people use a product.
I didn't try Zorbi yet but I tried Anki a few times and I simply hate its interface. Yes, it has all the features but it is far too clunky and bothersome to use for me. Zorbi in contrast looks like it has a easy, beautiful UI that I can actually use with joy.
No, it's been happening for years. If "too few" people have run a particular program, Windows decides it's not trustworthy. You can choose to run it anyway, or wait for Microsoft to make it "trusted" (for niche programs the latter doesn't always happen).
I found Anki to be easy to pick up for my simple use-case, and the interface isn't any worse than most other tools out there.
Yes, features aren't the only reason why people use a product, but some people (me, and many others here) do mainly use a product for its features. The lack of a comparison is somewhat of an oversight.
For that matter, there's no UI comparison either - no video showing a side-by-side diff between Zorbi and other tools (Anki, Mnemosyne, Quizlet, etc) - which, all in all, makes it a hard sell for most people who are already using an SRS, and I'm pretty sure that Quizlet has much more momentum and can acquire new-to-SRS users faster than Zorbi can.
How many months did you try Anki? It is not an instant solution. Needs you to decide how to use it best and try an approach. After a week i found i establish a way of both creating and reviewing cards nicely. I use it on Linux, mac for creating cards and review mostly on Iphone. (Do some card creating on iphone but not the bulk)
I didn't try Zorbi yet but I tried Anki a few times and I simply hate its interface. Yes, it has all the features but it is far too clunky and bothersome to use for me. Zorbi in contrast looks like it has a easy, beautiful UI that I can actually use with joy.