You don't like it. Countless others do.

Marketing is more the case with sugared water (ie.e. sodas, that actually spends billions in advertising each year), than with champagne, which is not a single-brand product but tons of different producers, and that was popular way before modern mass marketing was a thing.

People seldom get to even see champagne commercials except in posh magazines or during the holidays. Contrast with sodas, beer, and co.

No marketing needs to be involved, except to promote this or that particular brand of champagne, and that only in the last century.