No, but I'd say it's slightly more likely than by chance (after all, success begets capital).

I actually prefer Dr. Pepper, but a lot of people think Coke makes the best cola, Apple makes the best laptops, etc.

Should Dr Pepper have to spend a dollar per purchase to be the top result when you search for "Dr Pepper"? Is it good for the customer that when they search Dr Pepper and they stopped paying for the placement ads the first page is no longer Dr Pepper but instead "UUBUOI SODA 100% SODA COLA POP PEPPER 7 UP〖1L〗〖2L〗〖12OZ〗〖500ML〗" AND "FUUOYAY YUM YUM SPARKLE FIZZ 致癌神水"

While this isn't necessarily the reality for sodas, this is the reality for darn near every thing I look to buy off Amazon.

Soda is actually not a bad example to disprove your hypothesis. It's just one example of where your own health and finances will be better off if you ignore advertisers entirely.

and exclusively paying attention to what doctors say:

https://www.health.com/what-happens-when-you-stop-drinking-s...