a) Thanks for writing new posts. I have been missing your
writings for quite long.
b) IIRC, Dropbox started as getdropbox.com, just later on,
when money "was not an issue", they purchased the more
expensive one - dropbox.com.
same applies to uber.com, square (which started as
squareapp.com) and many others.
Best case I can think of is facebook, who started with "thefacebook.com", and later bought facebook.com. Also, didn't AirBNB start with airbedandbreakfast.com? (which now redirects to airbnb.com)
