I expect that the danger is in too much voltage coming down the line, not so much none. A lot of stuff would be fried. I’m not sure what protection there is.
Well, good thing they’ve been using solid state transformers since the 1970s. And power lines are Remote controlled since the 90s. They pop and reset. They handle even lightening strikes. It takes physical damage to short them out now.
Of course you have solid state surge protectors inside your house to protect your own vital equipment? Right? Mine is by my left foot. Some ppl call it a UPS with line conditioning. I swapped in some lithium batteries last month for higher capacity.
My hybrid solar inverters are always checking the grid for outages, spikes, and dirty power to flip into off-grid mode. But how many people have that? A hacker putting too much voltage onto the grid would fry a lot of homes' and businesses' appliances and/or even electrical panels, assuming the grid doesn't have checks and balances to catch the surge before it gets to the consumers.