I guess businesses trying to make money is a new concept for you people. That is what a free market economy does.
Perhaps communism is more your style.
What the free market economy 'does' is allocate scarce resources in an efficient manner, usually, or ideally anyway, by matching supply and demand at the equillibrium point. This does not necessarily involve continually making more money, if free market is operating efficiently business should gain an appropriate reward for their effort and risk - not more.
However free market is a process, fundamental to it's concept is that demand and supply is in a constant state of flux. Free market, if efficient, automatically adjusts to an efficient allocation automatically. Therefore if a supplier obtains more revenue per unit by reducing quality (evident from the complaints), they shift the supply curve upwards and demand curve downwards, so the equillibrium point will be at a reduced price and/or reduced quantity. If the move is misjudged, not only do you have consumers worse off but the supplier too.
Central to free market is consumer choice, for choice to be efficient consumers have to be knowledgeable about all factors relevant to their decision. Complaining about something is very useful in this respect.
Not tolerating people complaining about products is a problem normally associated with communism (this is neither required nor desirable for communism, it's just typical - perhaps due to the typical types of government who adopt it).