ReactOS does not steal any of Microsoft's code. In fact, having the
leaked Windows source code is as bad as looking at it... and the
developers cannot have them or they cannot work on ReactOS. The same
discussion occurred with FreeDOS about the leaked MS-DOS sources.
There may be areas where ReactOS will strugle in the same places that
Windows NT did or is currently. However, this will not be because of
code stealing. If we wanted a better, yet compatibile, operating
system than Windows NT, why would we steal the leaked code? That
wouldn't make sense.
I'm not a native English person, yet I can speak and type fluent
English. It's not that hard.