This is fundamentally different from Web streams' pipeThrough(), which starts actively pumping data from the source to the transform as soon as you set up the pipe. Pull semantics mean you control when processing happens, and stopping iteration stops processing.
The first reason is perhaps the most important. If you're concerned about your ISP, housemates, landlord, or someone totally random accessing your data, you could probably benefit from using a VPN. Any sort of activity on an unsecured WiFi network leaves your private information and browsing habits exposed to the world, unless you're using a VPN. Even porn sites can track your activity if you're unprotected. Pornhub tracks IP addresses for example, which means it has the potential to collect information about your site usage. But with a VPN, your IP address will always remain hidden.
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One rule of thumb Everstine has is that "if the price seems too good to be true, that should be a red flag". For instance, $3 for a bottle of olive oil or honey in the US might be suspect.
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Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it — only the code that is actually holding the reader can.