Free business idea: a domain parking service for people who want to retire a website but want to keep it online and out of the hands of SEO spammers.
Take a one-time static snapshot of the site when it is parked. Serve that very cheaply as static files. Pay for it either by charging users or by running ads against the domain and its content. Ads will be more lucrative, but obnoxious.
Inspired by Matt Haughey's experience here: https://a.wholelottanothing.org/2018/01/19/seo-spammers-wearing-a-printout-of-my-face-as-their-mask/