One of the problems with .app domains is the https requirement and some websites would not list them.
Sedo has now updated their offerings and you can list .app domains. They tweeted today:
📯 As promised: .APP domains can now be listed for sale at Sedo 📯 Good luck selling everyone! pic.twitter.com/shnfL0Cy1J
— Sedo (@Sedo) May 17, 2018
