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In this regard, is it safe to use proxy servers?

It's a difficult question to answer as of course aproxy is not unsafe in itself. A secure well run,proxy server is of course no risk to your data and why mostcompanies and educational establishments use a proxyto allow internet access.

One may also ask, can a proxy server be traced? However, all of that information is (usually) collectedby the proxy server, along with the requests you madethrough their proxy. So in the end, the websites you visitwill not be able to determine that your IP address hasvisited their site, which to some is considered an anonymous webexcursion.

In this way, do hackers use proxy servers?

They use proxy servers to monitor key phrases onsocial media and search engines, such as how to build a bomb.Hackers also use proxy servers to collect peoplespasswords and other personal information in order to steal theiridentity or spread viruses.

Is using a VPN for Netflix illegal?

In short, yes. Unless you are living in a country likeChina, Russia or Iran which makes it illegal to use a VPNservice, it is technically not a crime to use Netflix with aVPN if you are paying for your Netflix subscription, asit is not like you are downloading the contentillegally.