Those were cheap tablets from Aldi / Medion one could buy in Germany back then and they required a mandatory Google account to use them. Can't remember their name; they cost about 150 Euros back then.
I found it unapologetic to get my account, which I then have used for years, cancelled without any explanation or sign of wrongdoing.
But what should I say. I didn't pay for it so it was well within Googles rights and discretion. At least this made me aware that such behaviour exists.