Here’s my take:
The domain aftermarket has a big problem… it exists. This market shouldn’t ever be allowed to exist in the first place. ICANN should’ve blocked this bullshit a long time ago and forced registrars to just let domains expire and free the space. Also add a few provisions about unused domain names and about selling them.
The problem is that this isn’t what happens today. If you register a domain and never pay for it again then providers will often renew the domain and keep it to themselves and try resell it later. This is one of the biggest issues in the domain name market and GoDaddy is one of the worst offenders.
Yes that’s a good question but I’m sure that ICANN with all it’s wisdom and infinite resources and teams could define something reasonable. I believe the first step could be to simply make sure registrars can’t do what I describe before.