I haven't used Nim enough to write a good comparison. I am not mentioning Crystal either. If someone wants to contribute a comparison I'd be happy to feature it. It is supposed to be fair and simply outline the differences in features.
How can you build something in Jai before you have access to Jai?
I heard he only gives access to people who more out less guarantee they will use it relatively heavily, but how can I know of I will before I can scarily try it?
Basically I heard he only gives access if he thinks you will use it — not just so you can try it. That might work fine for people with enough time on their hands that they can say “I’ll do this full project in it, regardless of how it goes”, but I prefer to be able to tinker first to see if I find it suitable. For example, I’ve had projects where I though “ok I’m going to do this in Rust|Zig” and after trying for a few days realising that it’s not the route I want to take.
In any case, anyone can just download C3 and try it. You can’t just download Jai to try it. So my statement is still true.