Hi NTP ads are now frequency capped and may not appear as much as before for users who have joined Rewards.
Ad campaigns vary by country, and by the operating system. In some countries, there may be fewer ads observed throughout the month based on campaign size, delivery pacing, operating systems, content categories, and that advertisers have selected to run their ads to.
As we continue to generate additional demand for countries where Brave Ads are available, the consistency should improve over time.