It depends for what kind of AI and but no, giving sources and building with just volunteer data is just not possible at our current technological level. I'm mostly talking about large llms because that's what's really at stake and they train on huge amounts of data. Like ALL of stack, GitHub, Reddit, etc. Just fine tuning them on a consumer level takes more than 50 000 question and answer pairs, that's just one tiny superficial layer that's added on top.
Grammerly should absolutely add an opt out option to gain consumers trust, but forcing the the whole industry to do so is a disaster.
If individuals can opt out, so will websites to "protect their users". Then we get data hoarding, where stack and GitHub opt out of all open source options but sell it to the only ones that can now afford to build ais, Microsoft and google. it won't include data of certain individuals, the few that opt out, but I'm guessing eventually the opt in will be directly into the terms of service of websites, you opt in or you fuck off.
How does anyone except corporations benefit from this kind of circus. In 10 years, AI will be doing most office work. Google isn't dumb and wants that profit. They and openai have all the data, they can strong arm or buy what they are missing. Restricting and legislating only widens their moat.