Value of money is different in different places. $100 per month might be plenty for you to live somewhere while you'll starve on some other place.
So the minimum salary should depend on the cost of living.
And you can't compare the bitcoin's price inflation to the inflation of a country. A quick research yielded Nigeria's inflation has average around 11.3. Considering a 12 percentage inflation in last 4 years, the current minimum wage is an improvement from the last one.
No it should not! There should be no minimum wage at all. Why mess with the natural processes that take place in every ecosystem?
You have a need for a worker, you offer him/her salary, you negotiate. If It's too low he won't work for you, if it's too high you'll be losing money and risk going bankrupt or operating on 0 profit.
What happens when the government decides how much you should be paying your employees? If it's too much for you you as an employer will have to look for cuts. You'll fire one employee and divide the work among the rest. Minimum wage is stupid.
This is exactly the way it should be. Minimum wages destroys a type of job, that is too small for a formal wage, and yet brings a type of income or extra income to some people.
Besides my "socialist" country now pays about 2 USD per month, and no one wants to work here anymore. Why work full time where you can earn the same 1 hour playing some computer game online farming?. But now all infrastructure is collapsing as well. More beauties of socialism, nobody fixed the phones so why bother with phones (and the "best" internet here uses the land lines, its adsl).
The irony is that under the pretense of socialism, this country has in fact abolished the minimum wage. But, because there are no freedoms to business or the economy, it is useless for investors. We ended with the worst of both worlds, and the benefits of neither. Free healthcare that doesn't provide healthcare, because there are no medics willing to work for 2~4 USD a month and no country willing to manufacture medicine at those prices? (and the local production disappeared for the same and even more aggravating "socialist" reasons, ie. taking the means of productions, but not letting the workers decide things and not letting them procure whats needed for production or even set up prices for survival of the company, resulting in: closure. Everyone is without a job.
The more you let a government meddle, the worst it becomes. Trust me, i saw it happen in front of my own eyes. If you think things are bad in a free market economy, its only because you haven't
lived survived a central planned one...