Notification Channels is the official way to do this on Android, but it's up to the app developer to categorize them properly. They have no incentive to allow you to turn off ads.
Actually, they do have an incentive to let you turn off ads. If they don't, many users will turn off notifications entirely. At least if they categorize them, some users will just turn off the bothersome ones.
Actually, they do have an incentive to let you turn off ads. If they don't, many users will turn off notifications entirely. At least if they categorize them, some users will just turn off the bothersome ones.