What actually breaks on a website nobody maintains
The most common problem is missed updates. WordPress, the theme and the plugins receive security fixes all the time. If they are not installed, known holes stay open, and automated bots look for exactly those sites. The result rarely resembles a film-style hack: spam links appear on the site, visitors get redirected to someone else's page, or Google adds a warning to the search result. The owner often hears about it from a customer.
The second group is silent failures. The contact form stops sending email because mail server settings changed or messages land in spam, and the company spends weeks thinking inquiries have simply dried up. Automatic renewal of the SSL certificate fails and the browser shows visitors a warning. The domain renewal invoice goes to an old email address. The host upgrades its PHP version and a plugin that has not been updated in years stops working.
The third is backups. Many owners assume the host keeps copies, but nobody has checked how old the latest copy is or whether the site can really be restored from it. The value of a backup only shows at restore time, and that is a bad moment to find out there is none.
