People hold bitcoin for different reasons.
At this point the main reason is it's seen as an investment. It's just to make more fiat money. Nobody truly believes in the tech or what it has to offer now, which is evident by the ICO/premine coins that become huge these days with big central authorities running them.
I have been here for about 3years
You definitely joined when the sentiment had really changed. If you're interested in the more original perspective of it all people had, check out the documentary The Rise and Rise of Bitcoin from 2014. Most of the people in that documentary hold those original beliefs and it's quite interesting to see how much things have changed.
Actually, even the trailer shows that:
After watching that trailer, this dude gets it.