"... a company that you entrusted your data to now has a moral responsibility to do everything they can to hold on to that data until such time as you explicitly relinquish them of that duty ..."

I completely agree.

I will take this even further: that company should break a data retention law in order to hold ambiguously abandoned data that might be important to that user.

Further: that company should safeguard that data and protect it from unlwaful intercept or surveillance just like the data of any other paying customer.

Finally: no additional costs should be accrued beyond the original terms for this safekeeping of data.

Please do not abuse this.