Some of us can not use Paypal (and are not being told by paypal as to why after being banned) so have to use bitcoin, bank transfers, prepaid cards and cash for day to day transactions.
all centralized companies that do restrict access to their systems for all sorts of reasons (often not shared with the person being blocked)
all are "pull" methods where your account can be charged in an unauthorized manner
bitcoin, prepaid cards (such as paysafecard), cash and bank transfers are "push" methods giving the owner more control and cheaper fees for that manner
Not sure how practical paypal would be if you only want to spend a few cents (or more interestingly fractions of a cent!)
You can also get prepaid Visa/MasterCards, incidentally. No trackable information required.