Grinders are hobbyists who modify their own body with technological improvements. Just as you might find hackers tinkering away at software code, grinders dream up ways to tweak their own bodies. One of the most popular upgrades is to implant a microchip under the skin.

Amal Graafstra, a self-described “adventure technologist” is a double implantee — he has a microchip in each hand. In his right hand is a re-writable chip, which can be used to store small amounts of data. By pressing his hand to his phone, information can be downloaded from his body or uploaded into it. The left contains a simple identity number that can be scanned to unlock his front door, log into his computer or even start a motorbike.

For other people, though, the idea of implanting themselves with microchips may conjure up spectres of surveillance and totalitarian control. “Every Hollywood movie has told them that implants are for tracking people,” says Graafsta. “People don’t get that it’s the same exact technology as the card in your wallet. When someone uses a credit card, wireless or not, they are tracked because several other corporations know who they are, when they purchased, how much they spent, and where they spent it.”

Frank Swain. Why I want a microship implant. February
10, 2014. Internet: <www.bbc.co.uk> (adapted).

Based on the text above, judge the followin item.

In the sentence “they are tracked”, the pronoun “they” refers to “someone”.