As the [note](https://www.openstreetmap.org/note/3803910) mentioned, most betel nut stores are primarily, but not only selling areca nuts. I got the idea behind tagging betel nut stores as "shop=kiosk" when looking at kiosk pictures:
https://wiki.openstreetmap.org/wiki/Tag:shop%3Dkiosk
https://www.google.com/search?q=shop+kiosk&tbm=isch
https://www.google.com/search?q=檳榔攤&tbm=isch

Although types of betel nut stores (檳榔攤) might vary, so I understand why you ask the question:
https://www.google.com/maps/@23.0470289,121.1637067,3a,75y,342.58h,99.94t/data=!3m7!1e1!3m5!1s8ClfYXwk1Va-PSLy77H3fw!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3D8ClfYXwk1Va-PSLy77H3fw%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D189.84804%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192
https://www.google.com/maps/@25.0658754,121.201141,3a,75y,58.32h,94.77t/data=!3m6!1e1!3m4!1sK5YJ9NNT5lF5u015alTXiw!2e0!7i16384!8i8192
https://www.google.com/maps/@25.0291505,121.5539487,3a,90y,78.97h,99.48t/data=!3m6!1e1!3m4!1s26PebvP2PCoDP5PawwFBSg!2e0!7i16384!8i8192
https://www.google.com/maps/@24.110879,120.6965527,3a,75y,301.4h,90.71t/data=!3m6!1e1!3m4!1sDyNYiujURfw2uwqMRBMwEw!2e0!7i16384!8i8192

I am still open to the issue since some other people are interested in it.
https://t.me/OSM_cultural/6/656
