Normally with my bank cards I scrape off the last three numbers from the signature strip.
This means if someone steals my card they cant use it for telephone or internet shopping.
My natwest debit card just has the number surface printed on the signature strip however the monzo card is embossed into the plastic underneath the printing so scraping off the number is very difficult.
You may say this is unnecessary since monzo users can suspend their own cards but there are plenty of scenarios where I cant do that for example if my phone is stolen at the same time or I dont realise i’ve lost my wallet for some time and someone finds it.
I think you should adjust the design so future cards are just surface printed and not embossed as well.
Just my 2p from a paranoid customer who has been burnt before.
All the best,