So a private company has to do business in Singapore - and isn't allowed to complain if the Singaporean government restricts the rights of its own employees? They're just supposed to shut up and take whatever insane dictat exists in whatever jurisdiction they do business with? Why? If they're powerful enough to move the needle by threatening to withdraw from the country, then good for them! It's not that "whatever I like" is right, it's that there are universal human rights, and guess what, if enough stakeholders in these companies believe that no one should be doing business in countries or states that don't respect those rights, that's a good thing for the world.

Who should influence the affairs of a country? Take Russia now as an example. Should western countries stop Russia? Do you think western companies who pulled out of Russia are morally reprehensible because they were attempting to influence with business?

Singapore is not a comparatively poorer country [1].

[1] https://en.wikipedia.org/wiki/Economy_of_Singapore

Your last two paragraphs don’t seem aligned with your first paragraph.