Maybe I misunderstood from glancing at the pricing table, what is the difference between "public projects" (free) and "private projects" (enterprise $50/m)? My

Maybe I misunderstood from glancing at the pricing table, what is the difference between "public projects" (free) and "private projects" (enterprise $50/m)? My assumption from glancing at the page was that I'd only be interested if I could have the full version, and that I might be willing to buy a license to own it but not to pay a subscription to keep using it. Mainly because I don't mind an impulse purchase that's half hoping to turn out worth buying and half supporting a dev / product creator I think worth supporting, whereas if something wants money every month I want to actually know it's going to be a good use of money long-term, which is a much higher bar to clear in my mind. A side-thought: if it turned out to be a useful enough tool that I started getting colleagues to use it, and incorporating it in work done for clients, then I'd prefer it to be open source and ideally easy to customise / potentially white label.