In a sense that's the problem with this kind of site, it turns you into a commodity, and so people end up painting large groups of contractors with the same brush because they don't have enough information to do otherwise. In my mind, being a contractor, and hiring contractors is about networking. If you go on a commercial site where you're part of a big pool that appears homogeneous, expect to get treated as such.

Which country is that? Many places outside the US hire remotely. Even Canada. The US doesn't because of legal restrictions.

Most prefer to hire within their own time zone, though. People tend to quit if forced to work outside their usual hours, and nobody wants to do stand up meetings at 3 PM.