It's not just fuses, it's everything. Have you seen how many web-purchased home outlets, switches, fixtures, lamps, power strips, etc. are non-listed and pretty immediate fire hazards? Have fun explaining that to the underwriter if/when that causes a fire.
As much as I hate box stores, at least their liability provides some level of confidence...however with box stores dropping like flies no telling how long even that strategy will be viable.
It's really getting out of hand. If the Head Cheeto wants to regulate trade, clamping down on counterfeit/unlisted goods would be a great place to start.