Maybe they wanted their presentational site to run under a different domain than their ad/tracker distribution site so that engineers who unknowingly block thei

Maybe they wanted their presentational site to run under a different domain than their ad/tracker distribution site so that engineers who unknowingly block their ads can still learn about their business. And blocklist maintainers tend to immediately block root domains I guess. (At least I would if I saw an obscure subdomain from a party I want to block.)