Hi, there is an existing thread on card quality over here.
https://community.monzo.com/t/quality-of-cards/2545/
In my experience, Monzo’s cards may not be the ultimate in build quality compared to other new cards but nearing one year on, my Alpha card still looks fairly good while cards that have had less use and are of a similar or younger age from other issuers are peeling, splitting or scraping in some way.
All of the current Alpha/Beta cards are likely to be replaced by full current account cards seemingly within a year anyway.