Hah. Whois is gonna have a tough time working under GDPR. Their proposed solution is to be granted exception. The EU is apparently not that eager to work with them.
I mean, I think I kind of like that people's privacy is more important than some corporation being able to track you.
see for details: https://www.theregister.co.uk/2018/04/14/whois_icann_gdpr_europe/