Propaganda is by definition misleading and political in nature. It can lead to policies that can make life very bad for a lot of people (see Nazi propaganda).
A misleading, nonpolitical ad, may make you waste money, but it’s unlikely to lead to police rounding up foreigners in the night. Dishonest interpersonal communications will make you lose friends but it (generally) doesn’t set political policy.
Thats not to say that advertisements can’t be dangerous, but at least they’re regulated to limit potential damage. Anyone can push any political statement as fact and get away with it as long as it doesn’t piss off the wrong people too much.