>[0] In practice, if they didn't, they'd all just flock to AMD.
only when AMD had better price/performance, not because of ECC. At best you have a handful of homelabbers that went with AMD for their NAS, but approximately nobody who cares about performance switched to AMD for ECC ram, because ECC ram also tend to be clocked lower. Back in Zen 2/3 days the choice was basically DDR4-3600 without ECC, or DDR4-2400 with ECC.
only when AMD had better price/performance, not because of ECC. At best you have a handful of homelabbers that went with AMD for their NAS, but approximately nobody who cares about performance switched to AMD for ECC ram, because ECC ram also tend to be clocked lower. Back in Zen 2/3 days the choice was basically DDR4-3600 without ECC, or DDR4-2400 with ECC.