And the worst part is they will then brag about how low their opex is to the employees that are still there in the quarterly all-hands, as if it isn't representing how much money they are making but not paying to employees. Well, ok, the worst part is the doing rather than the bragging, but still.

For the unaware:
Capex=capital expenditures. These are the one-time purchases, which grow the business.
Opex=operating expenditures. These are the recurring costs of doing business. Payroll, utility payments, rent for office buildings, etc…

Basically, the stock market loves it when you buy things. Stock owners see it as growing the company, and therefore growing the value of the stock. But they hate operating expenditures, because those make the company seem less valuable; Buying Activision (capex) is great for stock prices, but paying their employees (opex) isn’t.

This is why big corporate acquisitions are usually immediately followed by huge rounds of layoffs for the acquired company. The new company owns the things, but doesn’t want the opex to show up on the next quarterly expense report. So they’ll usually gut the acquired company. Because they’re usually buying other companies for things like copyrights, patents, trade secrets, etc… If they were interested in the employees at the acquired company, they’d be using recruiting tactics and headhunting, instead of simply buying the entire company.