Comparing a proxy server with a browser extension is a bit off the mark as whoever uses a browser extension has the opportunity to monitor its behavior. But the comparison with an ISP is a valid one with the exception that no one can do without an ISP.
At the end, as you said, it all boils down to the question of trust.
I congratulate Ashkan on this great project. I am sure with the vision demonstrated in this project, Ashkan and other innovators will come up with solutions that will gradually minimize the need for trust.
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