As we have seen in the past with countless IOT devices, buying something that requires third party closed-source infrastructure to function is likely to be bricked one day.
One day Google might come around with big-tech-money, buy Eshtek to own a small part of the tech stack or a license or something and abandon everything else ...
Yes, thanks to trueNAS my data could probably be restored, but I still payed at least 600€ (2 licenses) for a then dead service that I would have liked to continue to use. This would only take effect if it comes to a reinstall but it will happen eventually.
Don't get me wrong, the fact that its a one time purchase is great, but it could be even better.
You are right, I forgot about the option to tinker with the underlying trueNAS. Thanks for the reminder :D