Looks like they've turned the feature on. I just got an ad in the Android app. My account is plus subscription.

https://imgur.com/a/jmh8EN5

Context of the conversation, I was asking it to convert a photo into Studio Ghibli style and it objected to the blender in the image so I asked if it could do one with a mason jar instead of a blender. Then it started to generate the picture, then instead it displayed the ad.

... Edit ...

Looks like this may be a existing feature I didn't know about "shopping research" connector. I can't seem to turn it off in the app .

I think this a popup for their shopping research promotion feature they added last week. I guess its a first party ad for their own new feature, but I don’t think its the third party ads that this article is talking about.