If those stores comply with EU law, that shouldn’t be the case. See for example https://ec.europa.eu/commission/presscorner/detail/en/ip_22_.... I can see how stores will pop up that don’t care about laws and regulations, but I would be hesitant to pay for anything there.
It's not "more ads". It's what Spotify has literally been offering forever, but couldn't show to people because Apple's rules literally prevent anyone from linking to any payments/purchases outside of App Store.
https://newsroom.spotify.com/2024-01-24/the-dma-means-a-bett...
they pushed hard for apple to open up in order push more ads.