Dynamic linking is allowed and you are allowed to ship those, so on Windows it's very painless. You just ship your Go/C#/Python/Rust binary with a sciter.dll that sits in the same folder. On Linux it's not quite as nice since you have to move the libsciter.so to the appropriate folder.
Of course static linking would be nicer, but I think it's fair to charge money for that (as well as for source code access). The project has to finance itself somehow.