@donavon @Netlify @zachleat I hear you.
FWIW if I've ever had anything deployed on a Deploy Preview that I no longer want to anyone to land on, I add this one rule to the top of its _redirect file:
/* https://the-canonical-url-of-the-prod-site 301
My tweets and posts live here on my own domain these days.
You can explore them here and follow me on Mastodon instead of Twitter where I'm not currently active.