When we compare Dota 2 and Leagues's as pay to win, you are looking at 100% wrong. Skins in both games are there as an 'extra' meaning you getting nothing from it but a cooler look. Never once on my grind through Gold did I need to invest in paid items to win. I play as Pantheon alot as he is my favorite character and I have paid zero dollars to play the game (as a whole, basic gameplay). I have invested in a skin because I wanted to 'invest' in that character not because it is a money wheel.
Other Example: WoW, people pay $15 a month for the expectation of updates, mods and changes weekly. They pay for these services. We can reference Guild Wars but until Oort is bring in millions of players than this comparison is terrible.
If Oort offered boosts or bonuses for players that is not pay 2 win. Take for example, if I wanted to buy a $2 24 Game-Time Deconstruction Boost. I want to invest in this item as a boost to my own desires. Oort is making money but I am not playing to win. If this game really does emerge to what I hope it would be, I would not hesitate to drop money into it for exclusive items. If any of you are minecraft people, we all know we would have bought a $10 unbreakable, maxed out Diamond pickaxe with all the stats at 5.
As the dev's have said, "what is pay to win in Oort"?