Here's what people were seeing: https://x.com/Yuchenj_UW/status/1995357492713570735
Looks pretty clear-cut to me - that's an advert for peloton.
And someone who decompiled a recent version of the chatgpt android app https://www.bleepingcomputer.com/news/artificial-intelligenc... found new classes like 'com.openai.feature.ads.data.AdTarget' and 'com.openai.feature.ads.data.SearchAdsCarousel'
That peloton received the advertising "free with your purchase of platform services" doesn't mean it's not an advert.