It looks like they grew somewhere around 300% since the start of COVID, a rif of 15% doesn't seem too far off estimates to me.
Devil's advocate but at the end of the day, if you're an engineer and Zoom wants to offer you a low-six figure job ($100k-$300k/yr total comp I'm sure is within the normal range for most people), as an employee are you "grateful" and just shut up and take it and don't think twice from the perspective of, who cares if I get laid off in 18 months?
Like the company doesn't owe it to you to keep you employed, so the question becomes, do they owe it to you to at least give you a heads up that your full time job isn't really that permanent? No company really gives any salaried employee any guarantee like that. Who are we as employees to say "hey, I think I deserved more communication in your intentions with me/my job"?