I don't think it's fair to rationalize poor labor practices. If they had paid out this worker's remaining sign up bonus and his 2018 performance bonus, we would've likely never heard of this. I know I won't recommend Tesla vehicles to anyone anymore (this is the final publicized labor issue "straw" as a customer).
And if Tesla is so cash strapped they couldn't pay that comp out for folks to move on mostly whole (60 days severance, remaining bonuses due, COBRA), management needs to be replaced with someone who can properly forecast cashflow, and more to the point, manage a business of this scale appropriately.
EDIT: I have reported the GoFundMe campaign you mention to have the organizer verified.