It seems that the "open access" is more marketing than something reality based they actually want to do.

https://dl.acm.org/openaccess ---> So how to access the content? Do I have to register or what? It the "open access" only for academic org's people or for everyone in the world?

https://dl.acm.org/ ---> Okay, nice simple search field without loggin in, but when you try to search something, you get thousands of results, even if you search specific author and the exact name of paper, you will get hundreds of results and the thing you want is buried somewhere on page 247. Filters of authors, years etc. are for Premium subscription. But just googling the thing finds the link to ACM... And want to get the actual PDF? Hope it says "free access"...

Only if the authors pay for it.

https://authors.acm.org/open-access/acm-open-for-authors-hom...

So will LLMs have premium-tier access or basic-tier access?

it is open like open in openai