I don't know where do you live where companies can just get millions of dollars out of nowhere to do those things
, but even Obsidian had to get Paradox to become their publisher for Tyranny because the crowdfunding scene wouldn't work for long (and they got like 4x more money to make PoE than they asked) and they still need a Publisher after the big success of PoE. If it was that simple they wouldn't have need Paradox and could have just continued being independent and yet they are almost bankrupt even though their games are being crowdfunded successfully and sell quite well. Also there is no way a newly made publisher out of nowhere can compete with the big ones already established. They wouldn't be able to get any good deals because already existing publishers can just choke them out of business. For example big ones can just make a deal with Steam and GOG (and any other big game selling platforms), saying that Steam and GOG shouldn't accept games from this new publisher in exchange of 10% more profit from every sale of this big distributor's games for 5 years (for example).
In the world of developing games or you have a publisher with a big wallet or you're history. There is no easy way out or becoming independent because you need money to come in always, you already spend most of your money to pay for your staff and other expenses related to the job (building space, electricity, water, cleaning services, etc) and you usually only get money when you sell a game, which if you're lucky happens a lot when you release the game but then until you release the next game you basically are spending the money you made from the previous game sales.
It only sucks money non-stop, so Devs need publishers to come by and give them the money they need to stay afloat before they release the next game (not to mention that these publishers already have good contracts with the major game selling platforms, so the devs do not have to sweat to get a weak contract that would mostly suck for them because they are the small fry and the game selling platforms are the big fish so they wouldn't be pushed by publishers but would be pushed by Steam/GOG/etc).