As if they can afford to lose sales to Tesla -- NOT
The ICE manufacturers are caught in a chicken and egg dilemma: should they gamble and invest in the charging and battery supply infrastructure required for general purpose EVs and volume production leading to economies of scale, or take an "organic, slow growth" approach, meaning 3rd party infrastructure. Clearly GM et al prefer the latter but Tesla has forced things with the Gigafactory. The Bolt should be understood as a compliance car, in the sense that it is not profitable at current scale and pricing.
GM may well be right in tie-ing themselvese to the CCS standard (although their current approach of not investing a dime strikes me as idiotic,) but I don't see a way for battery production to grow slowly and successfully.
At the moment they can afford to lose sales to Tesla. GM sold 9.8 million vehicles last year. Tesla delivered 50,000 last year, that's 1/2% of GM's sales. When Tesla is selling 1 million cars a year, GM might be sweating a bit.
Another reason that car manufacturers are dragging their feet about jumping into the current battery tech with both feet is they are scared they are going to make a major commitment to one chemistry only to have a much better one come along shortly after they commit. Management is risk adverse to new technology. Building a 30K a year car that is obsolete in a couple of years is no big deal. To commit to building a million cars a year only to have their tech go obsolete in a couple of years is scary.
They are largely ignoring Tesla right now because they see Teslas as rich kid toys and focus on what their direct competition is doing. They dismiss Elon's claims that he will be building 1 million Model 3s a year by 2020. They judge everything on past performance and Tesla has never been good about bringing new products to market anywhere near on time. I think they are underestimating Tesla. They are amazingly flexible.
So they look at the competition and figure the last one to commit to building a Gigafactory will be the winner because they will have the latest tech. Will Ford build a GF this year? Will Honda? etc.
The entire calculus of the industry will be completely and totally disrupted if Tesla manages to launch volume production of the Model 3 anywhere near when they say it will be launched. That will be panic time.