Respondent Eligibility?

While I’ve had success on Respondent, their way of deeming people eligible for studies is confusing.

When I check available projects, there’s only a few that pop up that actually apply to me and would be useful to participate in. The rest are irrelevant. However, when I go filter the inclusion of ineligible projects, there’s so many that would be perfect?! I’m not sure if it’s a location thing or what, but it’s definitely weird.

Has anyone else noticed this?