I avoid all things Samsung for a different reason: I don't want to support the subversion of the South-Korean state. It's become clear over the years [0] that the relationship between SK's administration is deeply unhealthy and anti-democratic. Until the economic power of the corporation is lessened it doesn't seem like the country is able to take effective measures either.
Doesn't your linked article counter that argument? Both the head of Samsung and a former president of SK received prison time for bribery. That seems big. I'm not knowledgeable about the full scope of the corruption, but based on that article it sounds like "effective measures" are entirely possible.
He served 200 days in jail, and seems to have lost minimal social standing. This was also highly exceptional to see any consequences at all. You’re right that the public outrage at the time was not entirely ineffective but the punishment was extraordinarily small.
[0] https://www.bbc.com/news/business-55674712