Let’s encrypt makes sure you control either the domain or a server the domain points to
‘ Control’ but not own, which leaves it open to criminal activity. In contrast, a SSL certificate authority will ask for multiple pieces of ID for corporate registrants including articles of incorporation.
The B2B use case isn’t quite what I was referring to with respect to the type of trust required for first time or consumer transactions such as ecommerce. That said, this enterprise doesn’t sound federally regulated at all because if it were, it wouldn’t be using Let’s Encrypt.