is there any harm for free proxy?

Do you mean if there is any harm in using them?

Depends on what you are trying to do. If you do not need to login any account to do your tasks, like in scraping or SEO, you can use free proxies.

However, if you need to login an account, on social media for example, you might have difficulties to login, it all depends on that proxy's IP history.
 
if you are scrapping google with them you are likely to get you IP visible
 
You should say so. If you want to browse google for personal purposes, especially from China, you are better off with a VPN, in this way you will have your traffic encrypted.
 
Also remember that even if you check that such proxy is anonymous it can change anytime, as they are not private/anon guarantee.
 
chinese have diffrent laws even accessing the internet is all logged every dam keyboard stroke .

you never use a internet line to do anythink , you always use a vpn and then use that vpn to do anythink you want .

many i say many goto jail in china just reading news be very carefull there internet rules are very strict .

chinese laws with online are the most strict be very carefull and it a warning i have read many cases of internet users going jail.

the internet providers have gotto record anyrhink you do and there duty is to send all logs back to goverment to cheek on your doings.
 
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