Who deserves to do promotions that way? I mean who would spend that much money? Satoshi Nakamoto? or who else?
Since bitcoin is decentralized that will not be anyone who will spend a lot of money to promote bitcoin with huge of money.
As for some people out there who promote bitcoin, they only just rely on their popularity, no more than that.
We have to focus on giving some learning about bitcoin to new people as much as we can, tell them the basic thing about bitcoin if they are interested they will naturally like and spend money to buy bitcoin.
Those things will make bitcoin to the moon and it will last a long time, no more deep crashes and make people lose with it.
I can think the likes of an exchange or someone else are good candidates for an ad of this sort. Of course they would promote their site, and maybe add some Bitcoin logo if they are gracious enough.
I'm sure SpaceX wouldn't object adding some paint job ad to their rockets for a price. But what if the stage breaks when returning? The largest part is the one that returns, they have increased their success rate but its not perfect yet. Specially when it lands in a barge in the middle of the ocean...
And if you paint an ad at the upper stage it wouldn't be so big would it? Well spaceship itself is very large but we haven't reached that point yet, best you get at the top is a smallish capsule.
With the private entities getting into space, i do expect more monetization creeping in one way or another, its just a matter of time.
Starlink may be profitable on its own (it better be), but i'm sure Elon has more plans for it, such as communications with their Tesla fleet...