You're typically introducing a positive, not a negative. Most people enjoy a quick chat and find being asked out flattering even if they're not interested.
> Maybe if it's a rare occurrence, but I think it would get irritating before long if a lot of people took the advice of asking out random strangers.
When you pick an obscure tactic, the whole point is to trade on the fact that others aren't doing so. If by chance that particular tactic does get popular, you simply pivot and pick another obscure tactic, or move to a field where there are fewer players.