It's not a weird notion, considering it works fairly well for Hulu. Even their "commercial-free" tier features commercials on select episodes because "reasons"
Perhaps 'weird' is the wrong word, I think ultimately it is an unsupportable position. It seems irrational to me in the face of alternatives (Amazon, NetFlix) with higher customer satisfaction.
Reasons like they couldn't get out of it, would be my guess. They are up front with that limitation, and I expect they will push to get rid of the rest of the ads.
I wouldn't say they're very upfront about it. If it's not truly ad-free, they shouldn't be marketing it as such. Including it in tiny text nobody reads isn't being upfront.
