It is interesting actually and I really like the project as a traveler. And, I think it is pretty nice actually.

They estimate...
Exchange Rate: 1ETH = 400,000 DENT
... and 1,000 DENT should be 1GB of DATA, so with the current value of the ETH, around 300$, it does 0.75$ for 1GB.
Am I wrong ?

The main issue is...
It is a big investment, around 6000$ minimum!
Source : https://www.dentcoin.com/presale/

This presale is designed for parties with prior cryptocurrency experience.
We try to keep things very simple, therefore we have just 1 Tier and a large bonus for all.
Minimum purchase : 20 ETH
DENT Token price: 1 ETH = 400,000 DENT (four hundred thousand)
Presale Bonus: 20% , so you get 20% more DENTs on top of your purchase after the official Token Sale has been closed.
Bonus calculation Example:
You buy DENT with 20 ETH, you get 20 x 400,000 DENT = 8 Million DENT + 20%Bonus = 1.6 Million DENT, so you end up owning 9.6 Million DENT Tokens.