This isn't a big news or something positive for bitcoin. Maybe this news can be used as a source for speculation, because US is already filled with the majority of the Bitcoin ATMs. More than 90% of ATMs installed till date are in USA. If Elon or Tesla has made its own product and installed in its factory or supplied out of USA then this could've been a big news in the cryptospace.
I tend to agree with this statement!
The fact that Elon Musk accepted the proposal or the one who initiated to let the other company install a Bitcoin ATM on their Gigafactory, it really means something. There was a theory that Elon Musk is Satoshi Nakamoto but that's proven yet. The moment that Elon Musk founded the Paypal, he really is capable to found Bitcoin, as well. It's just that, as Bitcoin is a decentralized one. No one has to be identified as the operator or else the vision will be broken, IMO.
The fact the Elon Musk also lets his people consider Bitcoin is something that is extraordinary. It means that Elon let his people take advantage of or take risk with it. But he has trust in it so it will be the first one. So, no surprise of this news but what ever the purpose is, still it's have a benefits to the Bitcoin.