I am licensed to use this equipment in the United States, but nearly all countries have some sort of requirements for licensing the use of radio spectrum.
https://en.m.wikipedia.org/wiki/Amateur_radio
As for enforcement, it depends on what you are doing with it. If you just buy one and start using it, it is possible that you can (accidentally or intentionally) interfere with other people’s radio communication. This might mean you cause problems with someone’s WiFi, or it might mean you interrupt air traffic communication or police radios.
If you use it a lot, and interfere with important traffic, then someone can use radio receiving equipment to triangulate your position (it’s not super easy, but it’s not too difficult to do with the right equipment)
Some radio operators do this for sport, but the FCC can and will track down major offenders.
https://en.m.wikipedia.org/wiki/Amateur_radio_direction_finding
Depending on how poorly you operate illegal radios, you can go to jail.
If you want a printer to “just work”, have an upgrade path to the next version when they come out, and don’t require a cloud account, then Prusa is a good choice.
If you want open source, open schematics, and open everything, then Voron based printers are a good choice.
There’s also tons of printers out there, just don’t support these shady lock-in manufacturers. Let’s not let 3d printing become what inkjet printing did.