https://eth.limo/ is one attempt of several to map ENS domains to web addressable domains. Ideally all the major browsers will support ENS for domain-to-IP mapping and the issue is solved.

Squarespace owns it now. Google is leaving the domain registrar business.

This cannot happen with domains. If you were to drop the domain, they could potentially reserve it for themselves, but as long as you're not breaking laws and pay for renewals, the domain is yours.