[gregjor]

Websites, support, and product features differ because of market competition. Prepaid carriers resell bandwidth purchased in bulk from the major carriers, so they have far lower barriers to enter the cellular market.

Counterexamples: Google Fi and Mint Mobile, both of which have good websites/apps, service, and product features. Verizon in particular sucks even for subscribers so I wouldn't expect their prepaid service to shine.