Elon Musk talked about how BTC mining with electricity isn't environment friendly but he invented electric cars, in near future if this actually becomes popular electric cars will be available world wide and billions of vehicles will be charged by electricity so how is this environment friendly?
The reason was just an excuse something like the biggest company in the world like Tesla would know that kind of things about bitcoin before even investing in it, Elon Musk is an Engineer right so something like this is easy.
I mean common before we invest in bitcoin we should at least make our own research in it, and in my experience, before even investing in bitcoin I already know that kind of thing in bitcoin.
Does it means Tesla doesn't do its research for a company that makes cars that cost thousands of dollars I don't think so, His tweets are obviously price manipulation and I'm not surprised if he dumps his bitcoin after announcing the news.