If WhatsApp had a similar issue because of some 3rd party software they rely on I'm sure nobody would give them a free pass.

WhatsApp probably has bugs like these discovered on a monthly basis, that we never even hear about.

The only time we hear about bugs with non OS software is when there is a masssive breach, FB initially reveals it only affects a small number of people, a few weeks later quietly revised that to a few 10s of million, and then a couple of months later buried somewhere that it was actually hundreds of millions of users affected.