Simple domain name hosting, nothing fancy but being able to assign custom dns records to allow websites to work but MX records be locked to proton. This could also allow for possibility of custom short names that could be used for proton drive sharing like bitly. Possibly even a dynamic DNS client in the future that could be used for remote connections to home network with OpenVPN or maybe a proton version of similar use. This would be especially beneficial now that google domains is getting shut down.