No worries, if I was a bad actor you'd be doing the right thing, and as many have already pointed out more often than not it is a bad actor. It's tough (trying to be) of the good guys not abusing the system chasing revenue at all costs, no worries.
I don't use local push notifications for advertising, either. I use them for A) location-based recording reminders created by users and B) notifications when a recording from the Watch is synced to your phone and ready to view, since that can take a minute or so if you're off wifi.
I remember one person reaching out shortly after the iOS 13 launch that I trigged the "Slopes has been using your location in the background" notification when I wasn't recording, which was an error on my side and I fixed that right away.
I did have an email or two go out around Christmas for a giveaway, so I certainly had some email marketing in play then. Maybe Slopes appeared in a notification from your mail client? But Slopes itself did not trigger any notification, push or local, for that campaign.