It's a shame browser makers removed FTP:// browsing support.
FTP was a lot more fun than the homogeneous blob of HTTP we have today. I only discovered FTP transparently via web browsing and clicking around as a kid.
Could we build a web-based service that acts like an FTP browser for the internet?
Once they know what hosts you run, it'll ping that hostname periodically. If it stays up and stable for a couple days, you'll get an alert in product: "Set up uptime monitoring on <hostname>?"
Whether you think this is valid, useful, acceptable, etc. is left as an exercise to the reader.