Purchasing expired domains that are linked from well known sites, then redirecting to your content: https://detailed.com/expired-domain-seo/
(I don't condone the technique, but the cat and mouse dynamic of SEO is interesting.)
miniblog.
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Woah, the median price of a .sexy domain is over $2,000! https://tld-list.com/tld/sexy
I like the emacs.sexy website, but that's a big chunk of money. The tld-list link above suggests that it's possible to buy these domains for more conventional prices.
It's interesting how [.] is increasingly the standard for talking about dangerous domains: http://evilsite[.]com
It's not a format that needs to be consumed by anything, although I suppose a standard makes grepping easier.
It can be really hard to find good free resources: for-pay providers are much more motivated to promote themselves.
I found it really hard to find quality stock images, and eventually found unsplash. This week I found pixabay too.
I'm sure this also happens in other domains.