You're not wrong. "Pay as you use" doesn't quite capture it, and "configurationless servers" isn't quite buzz-wordy (eg. short and memorable) to make marketable

You're not wrong. "Pay as you use" doesn't quite capture it, and "configurationless servers" isn't quite buzz-wordy (eg. short and memorable) to make marketable. Wide spread terminology suffers from the evolutionary pressures of marketing. Only the catchiest, most marketable terms propagate.