Crooks using card reading equipment can swipe money as you walk
They can also steal information that they can then use to steal your identity
It even possible when contactless cards were in bags and jacket pockets
The equipment needed is available for as little as £30 online
https://www.dailymail.co.uk/news/art...ng-street.html
It's old news, but with stories like this you can see why people are against the £100 limit or they are disabling the chip altogether.