You really don’t have any idea what a “marriage license” is, obviously.
A “marriage license” is simply a recording device. That’s it. The “license” part is a misnomer. There are no competency requirements, no exams or quizzes, no periodic renewals, no anything. Just two people who want to officially (meaning recognized by everyone, including the government) join themselves together in what has traditionally been recognized throughout history and have that fact recorded. Even the fee for such is extremely nominal and the deal of a millennium - one small cost keeps your recorded document viable for eternity.
I really am getting tired of this “government in the marriage business” nonsense. It’s like the government (courts) won’t ever be enlisted to officiate the issues surrounding marriage, ever.
I think the ‘license’ part originated in the dim past when communities decided that the prohibitions of incest and adultery were good things and should be enforced.