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> The issue isn't with sample size.

The issue isn't with sample size.

The sample is almost certainly biased, we just don't necessarily know how much and in what direction.

sample size is irrelevant if the selection criteria are poor.

If the sample size is large enough the selection criteria doesn't matter.

I guess that's technically true, but only if your sample size is 100%. :-)

There were examples of very large polls that failed spectacularly because of the badly chosen samples

https://www.math.upenn.edu/~deturck/m170/wk4/lecture/case1.h...

Take a sample of 5000 random people (an enormous sample size) attending the Republican National Convention and ask them which party they will vote for.