Raspberry Pi Connect needs your Raspberry Pi to be running a 64-bit distribution of Raspberry Pi OS Bookworm that uses the Wayland window server. This in turn means that, for now, you’ll need a Raspberry Pi 5, Raspberry Pi 4, or Raspberry Pi 400.
At the moment, the Raspberry Pi Connect service has just a single relay (TURN) server, located in the UK. This means that if rpi-connect chooses to relay traffic, the latency can be quite high.
Our intention is that Raspberry Pi Connect will remain free (as in beer) for individual users with non-relayed connections, with no limit on the number of devices.
Meanwhile you could just set up all of it yourself and learn a couple of things along the way but instead rPi insists on giving its users training wheels for everything. I think it would be much more useful if they provided a dns service with dynamic ip handling.