Weird, I’ve been forced to use a Mac for work, never liked it. I prefer Debian or other non-rolling-release distros with long term support, and haven’t had a Linux install get messed up in many years (since I used Arch, and something went wrong with my proprietary Nvidia drivers after an update).

If doing an overlay network (network on top of the Internet), you probably won’t be able to do much better than Tor or i2p.

We confirm the trilemma that an AC [anonymous communication] protocol can only achieve two out of the following three properties: strong anonymity (i.e., anonymity up to a negligible chance), low bandwidth overhead, and low latency overhead.

https://freedom.cs.purdue.edu/projects/trilemma.html

This applies to all types of anonymous networks as well (BT, Wifi, etc).