USCIS famously sent a whole bunch of RFCs to people renewing their work authorizations in 2021 because a bag of application fee checks was untouched in a corner of a basement. And the RFC meant delays that compounded existing delays, which meant people with completely legal status, with no other issues had to quit their jobs and sit around doing nothing for 12-18 months, for the simple reason that USCIS was too incompetent to renew a work authorization that they had already renewed several times and couldn’t keep track of the paper checks they insist you send in.

In 2021 (I believe they are changing this now…I don’t know when it will be implemented) USCIS only accepted payment via paper checks.