It is non-profit company, so investors should not be expecting too much increased returns for their investment other than the product and cooperation what this company provides.
If firing the CEO has no significant negative impact for actual product quality or cooperation, it should not be in the intrestes of investors.
Especially, if the argument for firing is revolved around profit/non-profit future of the company, if the expectations for the original investors was right (investing non-profit). In that case, it is not arbitrary or capricious decisions. But I would of course would like to see some transparency, since we don't really know what happened yet.