the supply is limited. bitcoin becoming scarce and the value going up, makes it harder to earn bitcoin.
Bitcoin has a significant value today that's why owning 1
BTC is hard. A year ago, it is not that hard to own one but now it is hard because it has become popular thus more demand and because
BTC has limited supply then its price would shoot up. That's why for us bitcoin enthusiast who already know the existence of it should work hard to obtain one cause one day it would be much more difficult that even just a satoshi would be valuable and there will be no bitcoin faucets anymore.
When bitcoin was introduced in the online crypto currencies world, its worth was really low. Buying bitcoin then was so easy and simple. People bought many bitcoins then. And I agree that, buying 1 bitcoin a year ago was still quite easy. As the price of bitcoin has increased to a higher level now and bitcoin is quite expensive now, so, owning even 1 bitcoin is really hard.