You don’t have to use a third-party short URL service. It can be hosted on your own site.
A lot of people are already using a third-party short URL service like qrco.de because they don’t realise you don’t actually need a service like that to make a QR code.
Ideally you should use a short URL that redirects to the full URL. The tracking parameters should be on the long URL, not the short one.
Why is that ideal? Seems more prone to problems if the short URL service shuts down or suffers outages.
You don’t have to use a third-party short URL service. It can be hosted on your own site.
A lot of people are already using a third-party short URL service like qrco.de because they don’t realise you don’t actually need a service like that to make a QR code.