The appropriate wage should be a reflection of the remote location's market rate, since that is a decisive business advantage in using human resources in nations with diverse standards of living.
Let's put it another way, one would expect an increase in salary should a Kenyan technology company seek to hire resources from San Francisco instead of hiring locally.
I believe that this model is ultimately beneficial to both parties - the employer gets to enjoy cheaper labour, with the additional bonus of corporate cultural enrichment, while the employees receive a competitive salary as well as gaining necessary skills to get a better life.
Some may claim thst this is an act of exploitation, but I see it as an effect of globalisation. Without the reduced wages, there's a good chance at those workers may never had the opportunity to upskill and learn, leading to a stagnancy in the remote nation's technical prowess.