WordPress websites and the servers they live on are a different animal when it comes to hosting, maintenance/support and security. WordPress powers over 30% of the internet due to its ease, capabilities and architecture.
But this also means WordPress websites require more power to host, additional security tools to keep safe, and more expertise & care to maintain than a traditional “old school” (aka HTML) website.
What used to be a “set it and forget” approach to older style websites, is now more like a European sports car: it runs best on good roads (hosting) and runs best when constantly cared for (maintenance). You’ll also want to make sure it’s kept safe from the bad guys (security)