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Those do exist and there's plenty of them: it's known as "co-charging". There's even one literally called ChargeBnB.

However, this is a different use-case than motorway charging. Home chargers are slow, designed for charging overnight. On a road trip you want to recharge in 20-30 minutes, and that requires much bigger DC chargers you won't find at home.

I used to advertise my outdoor plug on Plugshare (it should still be there, AFAIK). The only time it's ever been used is by my neighbors before they got their own EVSE installed, and my in-laws when they visit. No random stranger has ever used it.

I would expect that at least somewhere, terms of residential electricity provision would forbid one from selling that electricity to a third party.

It exists: https://www.plugshare.com/

There's various "airbnb for parking" apps, I imagine some will add "charger?" as an option.