In which part of the world most link building services Outsourcing being carried out and is they are ethical or just against Google quality guidelines

Well I understand that most of the links building jobs are outsourced to India SEO from UK
and United states. Well other countries like Pakistan, Thailand and other Asian countries are in line but India beats all in the race

Why India is leading because of its low labor cost, good English and IT industry is growing. Link building India is quite popular among all European countries and USA