When you sign up for a social media platform, a streaming service, a loyalty program, or a free app, you agree to terms of service that typically grant the company broad rights over the data you generate. Your posts, your photos, your location history, your purchase behavior, your political views, your health searches, your relationships โ all of it becomes an asset on their balance sheet.
This data is used to sell advertising, train AI models, sell to data brokers, share with business partners, hand to law enforcement, and in some cases sold when a company is acquired or goes bankrupt. The people whose data it actually is โ you โ are rarely informed and almost never compensated.
Custody means understanding what data exists about you, where it lives, who has access to it, and exercising your legal rights to control, correct, download, and delete it.
When you "deactivate" an account, the data is typically retained. Platforms keep it in case you return, and often continue using it for advertising modeling even after deactivation. Permanent deletion โ where supported โ removes your public presence but does not always delete the underlying data from backups and partner systems. True deletion is often impossible to verify.