It can ofc, but the question is always what do you do with the content :)
But in any case anything that is too sensitive to send from your own IP should not be sent over a medium that you have no ability to verify if it's being logged and by whom.
Open proxy operators aren't charities most of them are dubious at best.
If you want anonymity cryptocurrency VPS in data heaven jurisdiction or TOR is the best way to go, if you don't need that much anonymity than "proven" no-logging VPN providers are also better since they guarantee higher privacy than unauthenticated open proxies.
But in any case anything that is too sensitive to send from your own IP should not be sent over a medium that you have no ability to verify if it's being logged and by whom.
Open proxy operators aren't charities most of them are dubious at best.
If you want anonymity cryptocurrency VPS in data heaven jurisdiction or TOR is the best way to go, if you don't need that much anonymity than "proven" no-logging VPN providers are also better since they guarantee higher privacy than unauthenticated open proxies.