For current to flow out of your house the voltage inside the house has to be slightly higher than outside. Not by much, but a little. So the inverter has a higher output voltage than line voltage by design. If everyone does this and some of the power has nowhere to go, then the average voltage goes up measurably.
This wouldn’t be a problem if the grid had been designed to be able to bring power out of residential areas, but my casual understanding is that this doesn’t work very well with existing infrastructure, so with a bunch of extra power that has a hard time getting out the voltage keeps climbing until some inverters hit their safety shutoff.
Vegan ≠ Vegetarian.
Veganism starts and ends with “no animal exploitation”. And due to some weird ingroup/outgroup dynamics Extremely Online Vegans will get batshit insane radical with it and refuse to feed meat to their cats or insist that eating honey is fundamentally unethical.
I eat very little meat, mostly for environmental and partly for ethical reasons, but bringing up the environmentalist side of vegetarianism to defend veganism (a radical dogma based on a specific ethical stance) is missing the mark entirely.
With all that said, everyone should eat less meat, and way less red meat.