OK, so you just worded what you said above poorly. You implied that any practice of stats required certification. My comment covered both statisticians, and actuaries, but just used actuaries as an example.

Why does it matter that actuaries are certified? It's a professional role which requires dealing with some pretty heavy concepts. Employers presumably want to be sure that candidates meet some level of capabilities.

I guess I should add that the web world and modern data scientists kind of changed this but it was mostly because there were a bunch of smart PhDs who left academia and other companies to go work at rapidly growing startups, and their abilities helped grow the companies. Growing startups don't really care if their "Actuaries" don't have credentials other than beign able to monetize site data.