However, operating the computer for a long time and just keep putting new hardware into it could blow it up if it simply too old and cannot handle new technology it was not build to run on.
Hahaha...haha..lol (joke aside)
No my friend, because you need to change the mother board the day you need a new processor and it's using another type of CPU slot. You can use the tower (cabinet) over and over and over. You may have to change the PSU (power supply) sometimes when the new components requires more power.
In fact the only time you can "blow up" a computer would be to use your screw driver inside the tower when the power is turned on. It would not blow it up at all, just make some sparks and smokes and some electro shocks in your hand...
I did experience this a couple of years back, it made a small spark and a ugly smell of burned plastic.
I also had a accident with tower with a special cooling system where my processor where burned and the whole room did smell burned CPU (because of a production error from the factory). Out of the tower I could see some blue smoke raising and that was it. It didn't start any fire, just a spark or (small "pooooff") and the CPU died... and of course a loud beepy alarm from the mother board
You can start talking about blowing a computer the day a thunderstorm strikes your computer...probably some parts of your house is blown away in the same time
Well I nice try from you to make a big myth about PC building there..