I applaud you for taking a pee sample.
We had a vet once offer one “just to be super safe” and explained that there’s a special litter in the bag to make it easy. Then she charged us for it. And then she showed us the bag with basically a handful of litter that’d be barely enough to cover the bottom of the litter bin. It was then we learned to ask more questions upfront.
We never got the sample.
Would you accept a certificate issued by AWS (Amazon)? Or GCP (Google)? Or azure (Microsoft)? Do you visit websites behind cloudflare with CF issued certs? Because all 4 of those certificates are free. There is no identity validation for signing up for any of them really past having access to some payment form (and I don’t even think all of them do even that). And you could argue between those 4 companies it’s about 80-90% of the traffic on the internet these days.
Paid vs free is not a reliable comparison for trust. If anything, non-automated processes where a random engineer just gets the new cert and then hopefully remembers to delete it has a number of risk factors that doesn’t exist with LE (or other ACME supporting providers).