Independent of the costs (which are higher than you might expect), it's just not good practice to create a whole slew of random redirects "just because". There

Independent of the costs (which are higher than you might expect), it's just not good practice to create a whole slew of random redirects "just because". There's not a lot of random inbound traffic to "google.google" that plausibly needs redirecting. Indeed, you'd be causing the opposite problem, which is that by creating the redirect, you're now encouraging people to use it, and now you have an additional thing to support that you never really wanted in the first place. Remember that *.google isn't "just" a redirect or a subdomain -- it's a bona fide domain name, requiring registration, ongoing management thereof, an SSL certificate, configuration of automatic renewal thereof, DNS configuration, uptime monitoring, etc. And that's before you even get into any potential concerns re: the public suffix list, HSTS configuration/preloading, and other more esoteric concerns. It ends up not being worth it unless you have a real site that you actually want to launch, or at the minimum, a redirect that you really want to exist that you plan on using widely.