Ok but...

Seems like selling stuff a becoming a commodity app so lets make it productive Mercari.

From buyers perspective:
A seller cancelling a purchase happens too much bc they set it & forget, dont have it or sold it elsewhere... I should be able to leave a negative review bc they were irresponsible.
With that said, unlike others, just bc you allow free listings you should still require people to renew captcha-like manually that theyre still selling it.
Comments are stupid unless its questions about a product.
Allow for offers if avail OR NOT.
Your photo resolutions are crap. This is the 2010s & your Nokia phone pic resolutions leave too much up to the imagination with garage sale text only as a 1st language poor descriptions where people cant respond to comments.
Lastly, if there is dialogue between actual buyer & seller then the buyer should be able to rate the sellers communication (or lack thereof).

As a seller, really, 4 pics of crap resolution????
I should also be able to choose my privacy settings so as NOT to share w search engines, etc. Im your customer & not ad cos or search engines.
Put some AI into your comments that if I dont allow offers then stop people... You know when I type e...c insta, etc - cmon.

& searching, your back button is too sensitive & when I try to go back to my 10 mins of scrolling through stuff I have to start all over. All items to be marked as read.

NotAPPLEcable about Mercari: Buying & Selling App