Imagine getting a paper tiger of a company to give $2billion in stock and up to $700 million to pay for your R&D and production of a product you were going to do anyway. Well done GM.
Except of course that stock isn't worth close to $2 billion any more and they haven't received any of that $700 million.
'But', I hear you say 'the can sue Nikola for that money' - good luck finding it even after spending a fortune on the case.
That makes it look less a great move - don't count your chickens etc...