We already have aircraft based adverts (on beaches or the Goodyear blimp) so probably not a good avenue. Also every time we launch something in space there are

We already have aircraft based adverts (on beaches or the Goodyear blimp) so probably not a good avenue. Also every time we launch something in space there are pieces of garbage that stay there in low orbit for years, so it doesn't look like the place is considered of very high cultural value at the moment.