Prolific could greatly benefit psychological science by figuring out how to get representative samples from countries that are underrepresented in psychological studies. For example, would it be possible to recruit from countries in Africa, Asia, or South America? How do we know whether those data would be reliable and representative (especially considering contexts such as internet access, language, and cultural norms)?
This might take a lot of targeted work in places that don’t usually receive a lot of attention. But IMO the work would be worth it in the interest of opening psychological science to a greater portion of the world’s population.