Answer:
Yes, this pratice is ethical
Step-by-step explanation:
You are freely choosing to go on to these websites and most websites inform you that they are doing this. Edward Snowden, told the world that goverments are spying on them. Most people did not have a problem with this. Since, most people have a way to inform themsevles about the practices on the websites(by reading the terms of serve) and people don't care about spying than this is in no way unethical practice.