Ok, lets examine those:
First, the Printing Press. Let's first remember that presses have actually existed since around 1000 or before in various forms. Gutenbergs 'invention' was moveable metal type to print on cheaper paper with cheaper ink (and even that is in doubt since concurrent development was found in Korea, and other versions well on their way). The REASON he pursued that invention was his oft-lamented irritation that books were only available to the wealthy. Specifically, that the common man couldn't hope to own a bible to enrich his soul as well as his mind. Let's also not forget that he did not significantly profit from his invention, dying in relative anonymity and poverty until later records would bring his story to the world.
The steam engine is even more convoluted. We know that it was nearly accomplished in 1st century Rome, and there are reports of others since, though none were workable or common knowledge. However, they all worked on principles developed LONG before they were perfected. However, to keep the discussion simple we'll talk about the Newcomen engine (based on Papin and Savery). First, we need to understand that Papin was a medical doctor with a random interest in vacuums to improve medical treatment (his work was the precursor to the autoclave), and Savery was a military man who did his experiments on his own time and money (with his stated purpose being to protect miners by improving drainage, and to supply towns with water from remote areas). So the foundations of the steam engine was entirely humanitarian. Then Newcomen (a baptist preacher) came along and put it all together. There is no information about his 'purpose', but given his upbringing around mines and their conditions, and his calling as a baptist preacher, one could easily speculate that there was at least as much humanitarian calling as any other - ESPECIALLY since he made very little from his invention (same as most inventors).
I'm not sure why you link an Edison article to talk about the Telegraph. He was an operator in his youth, but did not invent the theory, nor the application. He offered some improvements (like quadroplex), but seriously, he's not the central figure. You could talk about Morse, who was involved in the commercial application of his refinements, but that would leave out Cooke & Wheatstone, Henry, Sturgeon, etc. Moreover you have to look at why Morse even had an interest. He was on an oceanic trip and realized that the work of Ampere could be utilized to exchange communication and intelligence (scientific and government related specifically). He then worked on it himself until he had it solved. The initial purpose of it was for the government to implement as an infrastructure device. It was only when the government didn't see how it could be implemented in such a way as to cover costs that it was given to private business interests.
The light bulb is another convoluted one, that your link over-simplifies. It wasn't invented by Edison. There were a dozen or more previous working light bulbs. Edison merely built on their genius 70 years later. You can claim that Edison successfully completed the first American commercialization, but NOT that he 'invented' the light bulb.
We're dealing with subjective thresholds here, but I don't see any of those that were INVENTED for commercial reasons...commercial use at least in part, perhaps...but not driven by commerce for commerce.
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