I think GDPR has made domain investing more challenging for the past few years. Despite the fact that GDPR regulations cover Europeans and European companies, some registrars have opted to block public WHOIS data across the board, while allowing registrants to opt out if they wish. Domain registrants in the US have been largely spared by this, but that is going to change in a couple of months.
As I shared on Friday evening, GoDaddy is planning to remove public Whois records in June. I am disappointed with this because Whois records offer valuable information about domain name registrants which can be used to inquire about domain name purchases, perform due diligence on a prospective purchase, and to do general research about domain registrants.