It happens in Europe too.
The rationale is that the employer gives you a lot of knowledge and tools which you could use to your own benefit... there are clear cases of abuse, some leading to litigation. I guess the employers want to defend themselves against IP theft basically.
What I normally do is ask for an agreement that projects unrelated to my employer's business is ok for me to work on, which I have always been able to get (sometimes they ask for authorization on a case-by-case basis, but usually it's just common sense).
> The rationale is that the employer gives you a lot of knowledge and tools which you could use to your own benefit
You also bring experience and knowledge to your employer that may benefit them while you're on holiday, or off sick, or even after you leave the company. Maybe we should send them a bill for these incidental benefits?
Does it really? I am from Europe and I have lived and worked in 3 EU countries, many of my friends have experience from other countries and I have never heard anyone mention this is. Obviously, my personal experience is limited. In what country do you live if I might ask?
What I normally do is ask for an agreement that projects unrelated to my employer's business is ok for me to work on, which I have always been able to get (sometimes they ask for authorization on a case-by-case basis, but usually it's just common sense).