"This can include the type of device, unique device identifying number (such as Android ID, Apple ID or browser fingerprint), what operating system is used on the device, what browsers and applications are used to connect to our Service by your device, your internet service provider or mobile network, your IP address and your device telephone number (if it has one). If you are logged into a registered account, this information may be associated with you."
Depop collects device fingerprints, unique device IDs, and browser information, and associates them with user accounts. Combined with sharing data with TikTok, Snapchat, and Google for audience matching, this enables cross-platform tracking.