I use the example of DomainH.ac to explain different domain hacks. I can’t afford the $25 renewal cost - so I’ve moved the explainer page within w4.rner.me - but maybe you can! It gets over 1.5k annual Google impressions for “domain hack(s)” searches.
And here’s some other “domain hacks” of mine that are recently expired/ing. Give me a shout if you’ve got a use-case and I might be able to resurrect to transfer to you: