A passive comment on hackernews is not really going to do jack, you need to keep on making noise, and try to get them to acknowledge your concerns. This is actually pretty time consuming and starts to cost you time/money. There are probably like 14 other channels talking about how great this piano is vs 1 channel showing valid criticisms, and probably few CASIO consumers who truly care about the plight of a hacker hacking an old calculator enough to do something more than likely forget about it in 24 hours. If you really don't like a company's practices, you basically have to become an activist to get an effect. Silently or tepidly "voting with your wallet" often does jack. This is more a critique of the concept that voting with your wallet is very effective, as the market often sucks at punishing crap companies and can often be manipulated with wads of marketing cash.
Isn't that exactly what the user you replied to did? How else could you have replied to them?