Lucky for the Mossad they are not building a competitor to the iPhone/iMac/MacBookPro/iPad etc...
They don't have to compete with apple they just have to find an interesting mistake in their code. On phones with tens of years of legacy firmware/modem/protocol code that's very hard to reliably stop.
(NSO is not Mossad and Mossad doesn't use NSO afaik)
Apple has way more budget than Mossad.