also, VPS ips dont change unless the network goes down then up, i dont know of any VPS that does that due to the fact that VPS tend to require nearly 100% uptime

one can do that, correct, but not everyone has a dynamic IP address, i know xfinity gives strictly static IP, and on top of that, thats your home IP, if you dont want to have that linked to your home IP or you want to play runescape legitimately then you run the risk of that IP being caught. and yes one can get a VPS and set it up with the port routing sort of thing... i did that for a while when botting on runescape. if one wants to do that then one can, however most people dont do that.

To get a new public IP for a SOCKS5 proxy, you can set up a dynamic IP router that disconnects and reconnects automatically, triggering a new IP. This can be automated with a script restarting the WAN connection or using a VPS with a SOCKS5 server like Dante combined with a dynamic IP service. But that works for one active connection. Eg. I use my Home Network, and two Mobiles with each one sim. that are 3 Ips, with a code can u "reset" the connection each Acc switch or fix each acc,.

and how does one create a proxy?

dont't waste your time with buy proxys.. create your own virtual proxys.. the stupides buisiness.