The bleeping and flashing lights on computers come from the days of ENIAC where the output was displayed on rows of coloured lights representing numbers in binary. It was only 70 years ago.. and yet we still do it.
However, there is a bit of a reason behind some of those daft search sequences on computers. They generally sell the rights to have products in movies – always used to be Apple but I think they stopped doing that now. However if no-one’s bought the rights (or they haven’t been sold) then they have to use something neutral, rather than Google which is what you would use. Because otherwise they’d never be able to sell that right to Google in the future.
Same with cars – they can’t completely hide the car’s body of course, but if no-one’s paid them they go to a certain amount of effort to avoid shots of the badges. Whereas if they have been paid, you see lots of them.
I think it’s NCIS where their coffee shop has a white cup with a round green logo on it to look vaguely authentic, but it’s not actually Starbucks.