It's like calling Windows customer care and asking about how to block the bloatware/ads/trackers they provide. Their business depends on it. Kobo's business depends on using their store service which requires signin. They expect you to use the device and their service as it is not tinker with it.
I don't think officially they'll help.
But who knows...maybe there are mobilereads enthusiasts working at their customer service and they'll help anyway...😉
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