Comment by wsc981
I noticed the app section included VPN.
Recently I've been looking for some VPN solution and found that many are quite expensive, though often you get a decent enough discount if you subscribe for like a year or longer. Also, I believe many services are probably not trustworthy (regardless of their claims).
A very affordable alternative is a DigitalOcean droplet with PiHole. You can connect with this VPN with Wireguard, which will probably work just fine on Mavericks. Been using this now for a couple of months and no issues. My costs are probably around 3-4 USD per month, but I don't use VPN all the time.
I haven't used WireGuard, but it looks like the main macOS implementation uses Go. Binaries built with Go 1.19 or below will work on Mavericks if you inject some compatibility libraries. (This is one of many things I haven't had time to fully document on the website yet, but I can help anyone who asks.)
But the big problem with non-native VPNs on Mavericks (by which I mean, any VPN which requires installing additional software beyond what is built-in to the OS) is that they tend to bypass any HTTPS proxies you have set up. Without an HTTPS proxy, Mavericks will have trouble connecting to most servers because SecureTransport doesn't support modern cipher suites. In e.g. Firefox Dynasty this won't matter since it ships its own (modern) SSL implementation, but Apple Mail (for example) will be unable to load most remote images.
This is why I have the note about privatevpn on the website—it took me a bit of searching to find a service that was low cost and supported a Mavericks native VPN protocol. I don't really "trust" any VPN service, but they're useful in certain specific situations.