#1 I do not agree with. This is a great idea for a tool, and I am willing to pay for it. This is an extension to my terminal and a useful adjunct to my shell, not a replacement for either.
#5, maybe but that's fine. Lots of things are Mac-only or Linux-only. It's a proof of concept. Moreover they appear to be working on some kind of standard specification for completion meta-data, which other tools can start to adopt and use if it turns out to be a useful spec.
#2-4, it's open source (at least it looks like it's open source from the website). If the startup sells out, the project can be forked.
I have found "it's open source" to be a real-life meaningless response to "I prefer tools that I am likely able to have a significant amount of autonomous control over in the future."
The software market has very effectively figured out how to make things "open source" in name only (offhand, Canvas is the one that's killing me these days), and unfortunately now all such claims must be taken with a huge grain of salt.
#1 That's fair. Each to their own. For me I wouldn't be willing to pay even £1 a year for it.
#2-4 Firstly, just because it can be forked is not to say that it will. It's not easy to maintain a whole project in your spare time. Also, this may be a moot point since the completion engine is supposedly proprietary (as per another commenter).
#5, maybe but that's fine. Lots of things are Mac-only or Linux-only. It's a proof of concept. Moreover they appear to be working on some kind of standard specification for completion meta-data, which other tools can start to adopt and use if it turns out to be a useful spec.
#2-4, it's open source (at least it looks like it's open source from the website). If the startup sells out, the project can be forked.