[disadvantage]

> How common is this scenario?

It's getting more common the more people discuss it, and learn that 'Hey, you can do that?'

> Do you think this is a growing problem in the industry?

It's been around since forever. There's also different forms it can take. Slowdowns[0] etc

> How are employers handling these situations?

Since it's usually done stealthily by employees, nothing much can be done apart from being a good leader and leading by example.

[0] https://en.wikipedia.org/wiki/Slowdown