It's not only about bad working conditions but also Human rights. Just go to industrial area to find how people survives there. 10-12 people living in (10x10) feet room sharing 2/3 toilets more than 100 people. They don't get their salary in time & even it's delayed 3/4 months in most of the cases. They used to have their breakfast & either lunch or dinner with 1 riyal khabouj. Their day starts nearly about 3am & ends at nearly 7/8 pm. You may go for shopping in City Center but they are happy enough to go in Al Attiya market in Industrial area. Passport being held by the employer & can't move to another company without STC (Slave transfer certificate instead of NOC). 2 years no entry if you cancel your visa. Whereas it's only six months in UAE if you cancel before finish of 2 years & "No Ban" in Bahrain. If any abused labor fight for his right then must go back to home country without getting paid. Those laborer going to build up World Cup 2022 luxury stadium in Qatar.
I understand that you are thinking this question arise to rob Qatar world cup. In fact this question arise long time before.