Doing proxying is where lies all sorts of madness, since now you are subscribing yourself to hosting of potential CSAM and doxxing people in photos/videos since we are unable to signal deletion to you. Also, posting a link to anything that is not media, may prompt browser to prefetch its content and disclose IP address. If people want to protect their IPs, they should use TOR (or at worst VPN), otherwise you are doing proxying for the wrong reasons