Assuming your samples are not biased, 1000 subjects are generally far more than are necessary to demonstrate an effect. People who complain about sample size are generally not that well-educated in statistics.

A sample size of 198 as per this study is more than sufficient to draw pretty strong conclusions.

The issue is not the sample size, it's that studies like these almost always involve a very homogenous population of young college students.

Also not replicated that I can see.

except they can be