Dead internet? Not as long as people are using it to freely exchange ideas, opinions, and - yes - creations.
But the key word there is freely. Put it online, it's public domain for people to do whatever with; where immorality comes into it is when someone uses this free stuff for monetary gain, and to me that's an entirely different conversation.
That's basically the situation we were in before 1700-1800 depending on where you lived. Since ideas come from inspiration, and inspiration and talent comes from God, not from a specific person... the identity of the author wasn't something that mattered a lot. Art and science in general were thought as a collective heritage. Artists and scientists found other means to get paid -- they needed to eat, after all -- than selling the work they produced. They could sell for a high price the initial copy to printers, or keep control on the distribution of the work (ie, they didn't put in on the Internet

). Mozart made subscription concerts, famously, but many had a side, or rather main job or did commissioned work -- which meant that they were paid by someone to create something specific, and as soon as it was created, it was put into the public domain, not restricted for the use of big IP holders that paid the commission.
At some point, however, it was collectively decided -- well, petitionned to the ruler, who single-handedly decided, to be honest -- that MORE art and science would be created if the people who wrote books coud get money from it. It actually was the end of a process that started earlier, with the printing press. Circulation of information was more centralized and some authors could get a printing privilege, for a limited amount of time, to be the only person allowed to print a specific book. So, in order to replicate a work, they could charge what they wanted for the printed book. They couldn't be competed out by other printers, since it wasn't allowed to publish unlicensed books.
At some point the idea that everyone should get the royal privilege of being the only one to copy their books emerged and was passed into law. The reasoning was that if artists were financially incentivized, they'd produce more art and society, as a whole, would be better. In the UK, the Statute of Anne granted everyone the monopoly on printing the book they wrote for 14 years (renewable once) because it was deemed that more book would be produced. The Statute aimed, according to its title, at the "encouragement of learning": a short temporary monopoly for the author, more art rapidly available for everyone.
While the circumstances have greatly changed since, we've mostly seen the collective choice moving toward more extension of the monopoly (70 years, 50 years after death of author...) than the reverse. You're advocating for a serious shift in methodology, but it's not something unheard of, it was just the general situation that surrounded the creation of art for millenia, except in the 200-300 last years, where the state-enforced monopoly granted to authors has been deemed more beneficial than the alternative.
I am finding it extremely difficult to quantify whether it's collectively better to have the market determine the value of art and using it as an incentive to produce more. It can cause a shift toward producing low quality content that will sell well. It is also reaching a coverage that really limits the diffusion of art, especially in a period where reproduction of it, in digital form, has become costless, which wasn't really considered in the earlier centuries.
I am not certain that having authorities stop granting temporary monopolies to authors would have a positive influence on the amount of art provided. It is sure, however, that most of the art that is produced now won't benefit the public until nearly 100 years. That's a long delay, especially with most art having lost marketable value long before this date. Don't you think one would need an incentive to publish anything online if it was tantamount to renouncing to IP? Though as you mention, most of what we write on this board isn't written with the expectation of profit and yet we do it... In the least, it should remove commercial influence off the Internet.