you can also find plenty of DC Christmas lights with no flicker at all. downsides are they have a brick to plug in and they can't be daisychained as much. I've got some strands that can be daisychained up to 300ft/91m - these cover the vast majority of home use cases, and the lead between the plug and first light is about 20ft/6m so it's usually possible to combine multiple sets. I once had 12 strands on one tree and while that required 3 plugs, it was something like 60w total so I just used a 3 outlet end on a 16awg extension cord

What do you get out of spending your time radiating negativity?

Is it making you feel better?

I have almost no electrical knowledge but I think "earth" or "earth ground" would imply that wire is connected literally to the earth at some point, e.g. in home wiring there can be a copper rod driven deep into the earth that all the "ground" wires are connected to, making those earth grounds?

I think the word "ground" by itself is often just used to refer to the common (shared) part of a circuit, eg. on an arduino there's a ground (GND) pin that's obviously not connected to the earth, but used as a shared source of "lower electric potential" for all parts of the circuit to use to create the difference in potential required to have "voltage"

Why OP says there is an earth wire in the picture and not just a ground, idk. Those 3 wires could easily be used for something that has no earth ground. Maybe the color scheme of those 3 wires is a standard one and the green usually is earth ground? No idea. Maybe there's just different terminology standards than I'm aware of and in the shitty hobbyist world I live in we all use the words wrong ¯\_(ツ)_/¯