You can register for domains through AWS Route 53 and it'll automagically register on Gandi with WHOIS protection and link it up inside Route 53. You then don't need to leave the AWS UI, it just seems like it works magically.
(I think this is true...I can't remember now actually).
All the interviews I have had with major tech companies involved white board exercises except for one. The one that didn't involve a white board focused on discussing prior accomplishments in context of the job to see if there is alignment.
I think white boards are great if you use the information you gather from them in the proper way. Engineers solve problems, teams create global companies and change the world. I look at white board sessions to see how you can approach a problem, are you big picture or in the weed detail oriented. When I ask the question what do you focus on? Whether you solve the entire problem or not is not the deciding factor in my opinion.
Also, I think with the volume or applicants companies are looking for ways for people to prove they as contributed to their resume achievements and were not a back seat passenger the rest of the team carried along.