If the payment in bitcoins will be as an additional reward, then no one will mind this. The problem may arise if the bonuses that were previously paid in fiat are changed to BTC. In this case, the consent of employees will be required, since some employees may not be ready for such changes.
That is the thing, even when receiving free money, people could be complaining about it and that is a big issue. Like look at El Salvador, you are not forced to use bitcoin at all, it is not something that you are forced and if you have to accept it as a business owner, you could turn that into cash via the app instantly so you do not have to worry about it, it is only for the people who would like to use it and that is not a big deal to non-crypto people, it is only a positive.
However, people are complaining about it and that is the problem. If you offer free money in crypto form, there will definitely be some people who will complain why it is not in fiat and in their bank accounts, makes no sense to me as well but there are people who complain about everything.
Let's just face the sad reality, that you cannot please everyone no matter how good you are. However, if bitcoin will be given as a free money to his employees, i don't think most of them will complain. And they have no right to complain when its only given as a bonus to them.
Bitcoin is not just an easy money, its even more valuable from the fiat currency. But for those who don't know it, it will be a waste of time keeping it. But for those who knew that it would be a great investment in the future, surely they will be grateful for it, than to complain.
Bitcoin is volatile and not everyone can handle that, many this is the main reason why many are still hesitant with Bitcoin. Yes, if its free then why not? Maybe giving them free Bitcoin can start their curiosity about it, and start searching on how Bitcoin works and how they can sell Bitcoin. Employers like this is a good one, they care about the future of their employees.
For ordinary people and lack of knowledge, they must be worried about the volatile Bitcoin price. Even though if they understand how to use Bitcoin,
they can use the volatile Bitcoin price to make a profit. Therefore it is very important to learn Bitcoin properly, to know how to use Bitcoin. I agree that
a good employer is how they think about the future of their employees so that their lives are more prosperous, most employers only think about their
own interests. So if an employer gives free Bitcoins as a bonus to their employees, it is a good thing that can change the future of his employees.
Not only the employees will get extra money, but employees are indirectly given education about Bitcoin. Because as you said giving Bitcoin for free,
will arouse curiosity. From there employees who curious about Bitcoin will start looking for information and studying Bitcoin, once they understand
about Bitcoin, that's where their future will change for the better.