I can only assume that when Hertz decided to make a large part of their fleet BEV was when the BEV market was red hot. Let's not forget that up until a few years ago there were only a few offerings available and most coming in within the premium/luxury market and to most it was still a novelty. As touched on above, those who wanted to try it did, realised the pros and cons and upon renting again they rented what worked for them.
I rented cars for a 12 years when I was working between Canada and the US and wasn't being paid to spend time at chargers. There were days I would be covering 400 plus miles in a single day and if I had a BEV during the winter months, well, I would need to charge at least once and again at night.
BEVs are fantastic for the right situation and dare I say, as an owned vehicle. I never understood the draw of a BEV as a rental unless ones visit/holiday/work travel did not require anything more than getting from the airport to the hotel.
I had a VW ID5 for a year and loved many aspects of it but equally struggled with the horrible range it had, especially in the cold and other shortcomings. And this considering I do not drive much these days. Even so, I was charging it 2-3 times a week at home with the minimal use it was getting.
`Give it a few years when the next leap in battery tech should happen and Hertz and the like will be back at it. I do however suspect rental companies, and the general public for that matter, will be clambering to buy an ICE at the last min when the cut off happens.