However I am surprised that registrar (and parking companies) don't seem to have any particular protection against DDOS attacks.
Some if not all actually do, and they're all aware of the reality of DDoS attacks. Probably think of bank A using only security people, while bank B uses security people, WiFi cameras, etc. based on what they feel they can (or should) afford.
well totally understood, but rather than being a big or small customer, customer should be protected instead of getting kicked.
Absolutely. But...only if you can realistically afford to without having to sacrifice others if it can be helped.
Anywho, Name.com posted an update since then. At least they're honest, which can't be said the same of other providers.
Then again, even too much honesty isn't probably good...