Datum can never be successful because all of their assumptions on which their reasoning is based are faulty.
How so? What assumptions do you question? The general idea seems to be viable imo.
The crypto-economics are wrong.
No-one wants a new database that only stores user data.
No-one wants to get paid to see advertisements.
well, I for one would use such an offer if the rewards were high enough. also, it is not only about watching ads.