Why do marketers always tarnish the name of new concepts by turning them into buzzwords?

For example, "Cloud" is one of the most misused and overused words on the internet. If something has anything to do with the internet, it's likely to be plastered with the word "Cloud".

It's like "App" all over again. Anything remotely related to technology is called an "App" by it's marketing team and layman users.