Unfortunately, it's the wave of the future.
Ads are incredibly lucrative. So it makes sense for streaming services to have an ad-supported version that's really cheap (to entice people) and then jack up the price on the ad-free version.
As it is, Netflix has higher revenue per subscriber for the ad-supported tier ($7/month) than they do with standard ($15.50) or premium ($23) ad-free service.
That's why you see so many amazing deals offered on the ad-supported versions (esp. with annual plans) but not so much on the ad-free ones.