Which will be the advantage to own the Petro coin? If this will reflect the price of Venezual oil, wouldn't it be the same to just buy some oil ETF ?
In other words the price of the Petro, theoretically, could be higher (even much higher) than an oil barrel, if the project succeeds.
It could. And it could be lower, even much lower, if the project doesn't succeed.
- EXHANGES: Petro will be traded in the secondary market: exchanges around the world and in Venezuela.
Probably. Remains to be seen, by how many.
- MASS ADOPTION: Petro will be accepted for payments of taxes, fees, public services and more from day 1, therefore offering a large adoption (larger than any other existing crypto).
Nothing indicates that the petro will be accepted for these purposes "from day 1". As according to the white paper the petro will be accepted for these purposes with a discount of
at least 10% this promise only is relevant for the case that the petro will be less than an outright success. Only if the petro trades at least 10% below par with a barrel of Venezuelan oil it can be of any interest to use it for e.g. tax purposes with the acceptance price given by the formula in the white paper. The promise therefor is no incentive for a large adoption. (As long as you trust the Venezuelan government - I wouldn't - it gives you some assurance that losses might be limited.)
- BIG NUMBERS: Petro will be accepted for Venezuelan oil trade (which is in the range of 8-25 billion US dollars).
This in itself will only result in big numbers if trading partners first want acquire petros and then pay for Venezuelan oil with them. Many won't.
- ATTRACTIVE PRICE: The pre-sale and ICO will offer Petros at an attractive, discounted price (in part): companies with Petros will then be able to buy oil at it's normal price with Petros.
There might be private negotiations where investors are offered those discounts. (Or not.) So far there is no way to secure them for investors who want to buy petros through the official way indicated on the elpetro.gob.ve website.
- PRIVATE SECTOR ADOPTION: Private companies in Venezuela (like shops) could start accepting Petros, once they are launched in the market, increasing the adoption even more.
They surely could. Actually I expect the government to exert pressure in this direction if they don't do so freely.
- EXPANSION OF PUBLIC SECTOR ADOPTION: Eventually, the State could even decide to pay public employees and social benefits with Petros and expand further its use.
It could. I rather expect the government to give out menes (minimum unit) as bonuses. If it really would switch to pay public employees and pensioners in petros (menes) in full this probably would clash with the promise of a limited supply of petros.
- ANTI-INFLATION: Because of its anti-inflationary nature, the Petro could be much more interesting for Venezuelans than Bolivares and more convenient and safe than US dollars
There is a promise not to increase the amount of petros, but so far no guarantee. One cannot speak of an anti-inflationary nature of the petro therefor. Especially if the government embarks on a wider use of the petro (for instance by paying salaries with petros) it might break the promise. There is no guarantee either that the petro will not become as volatile as other cryptocurrencies. It would be less convenient and safe than US dollars then.