Login Into Fresh Arch Linux With Telnet

Today I was building some new Arch VMs at work and noticed something a bit worrisome that I had to test out specifically. I¬ sure if this is something specific to Arch&install or systemd. All I know is that certain systemd sockets get enabled without me specifically doing so (which goes against The Arch Way IMO). These socket files automatically enable services (such as sshd and telnetd) when someone tries to connect to their respective ports. It scares me that this happened without me telling Arch to do it. This video shows the exact process I went through to reproduce this behavior. Does anyone have any insight in to why this is happening? Jump to 9:28 to see the actual socket activation.