For example, in Switzerland you cannot cancel your landline or mobile phone subscription (at the two largest providers) without calling or chatting to customer support. They excluded "cancellation by mail/e-mail" explicitly in their terms of use.
I recently tried to cancel my landline and first they told me I could only cancel within 1 to 3 months up to the expiration, not earlier (which is clearly against any existing law).
Care to expand beyond a meaningless statement? What has your experience been?
Just that: my experience has been roughly the same in an EU country and the US: there was not some magical interface or customer-centric viewpoint the imbued everything by virtue of the EU.