I remember seeing a request to add nip.io to the PSL (they don't approve requests where the subdomains are IP addresses). What do you think the future of these sorts of services are now that Let's Encrypt offers free IP certificates?
I hope IP-based certificates will ease the pressure on nip.io/sslip.io.
I also hope I get fewer takedown requests. I currently get ~25 takedown requests every week (phishing, copyrighted material, illegal drug sales, unauthorized mirrors, command & control servers).