Their site will break consistently in any case. Running a site in 2024 comes with a responsibility to update regularly for a good reason.
There are more than enough forgotten kebab shop restaurant pages that are now serving malware because they never updated WordPress that an out of date certificate warning is a very good "heads up, this site hasn't been maintained in 6 years"
If we're talking hosting even a static HTML file without using a site hosting company, that already requires so much technical knowledge (Domain purchasing, DNS, purchasing a static IP from your ISP, server software which again requires vuln updates) that said person will be able to update a TLS cert without any issue.