They had to hire people from industry and they still do, except for obsolete courses. Nowadys, people who want to get a high salary, follow a Mircosoft course, rather than a University study. As it turns out, Microsoft certification counts more than a University degree. Universities base their supposed superiority on scientific research, as opposed to merely training students in technical skills. But such research at universities has been a costly failure.
Most research now takes place outside universities.
Universities try to save face by fooling people into thinking that the ideas dreamed up at university are somehow fundamental and that commercial laboratories somehow benefit by applying this when making commercial products. Ask commercial laboratories and they will most likely say that they prefer to receive the money directly that is being poured into universities. Similarly, companies would rather receive cash, instead of enjoying the perceived benefits of 'fundamental' research. How much research that takes place at large companies is solely designed to evade tax and to obtain subsidies. Common folks, who have contributed most to making computers and other products into what they are now, have paid for all this, yet scientists arrogantly claim the credit.