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The term “data bleed” is now somewhat popular, but also a little hard to define, since the term itself is not well defined on the internet. In general, data bleed occurs when there is not transparency into data use, and users or other parties experience mysterious data quantification, or where data transfers happen without the express permission of the user.
In today's IT world, data bleed often has a lot to do with the practice of “piggybacking” or using device data processing capability in an unauthorized manner. When this is done for the purposes of mining cryptocurrencies, it sometimes called “cryptojacking.” These types of illicit behaviors can cause data bleed for a user's device profile.
Other problems involve data-hogging applications that might not be transparent in how they affect a user's data rate. When consumers talk about data bleed, they are usually talking about a sudden increase in data usage from a device that they cannot diagnose or figure out. Data bleed can signal malware infection, hacking or other kinds of problems.