I mean, libraries existed and have been freely accessible for longer than the internet has been around, and you can learn pretty much everything you can in schools being found in them, but their existence didn't make it so there was no need for schools. Access to information doesn't really matter if you don't have the aptitude to process and understand the information, and that's the main point of schooling, even at the college level.
Certainly, libraries have existed and been accessible for a long time.
However, they are purely one-sided sources of information which as you pointed out, is not enough for some.
The internet on the other hand is not merely a one-sided source of information.
There is plenty of educational video content in various styles so people can use what suits them best.
For those that learn better doing something, there are plenty of examples of instructions/tasks/challenges/etc. that can give you something to start with.
Perhaps the biggest difference is that it is not simply one-sided, there are plenty of places for discussion and people willing to help you out personally.
If you have a specific problem, a library would probably contain the methods to solve it, but they'd be abstract or for something similar, and it would be hard to find and apply them to your exact problem.
In contrast, on the internet, you'd be able to ask someone to help you with your specific problem and get suggestions/advice specific to your problem. If you have trouble understanding/applying something, you could ask for additional information/help.
There is much less of a difference between what a college/university offers compared to the internet than there is compared to a library.
That is not to say there is nothing to offer.
Like I mentioned earlier they offer degrees/certifications and connections.
They also offer great opportunities for people interested in participating in research.
However, if you don't care about those things it might not be the best option.
Especially in places like the USA with high costs associated with it.
It may be far more economical to learn in your own time using the internet.
If additional help is required it would also likely be far more effective to look into private tutoring or a mentorship program instead.
The average cost of college in the USA is almost $40,000 per year.
You can afford a lot of tutoring, classes for things you particularly struggle with etc. and have most of it left over.
Doing so also allows you to work at your own pace without additional costs or learn alongside a regular job.
When you consider it's $160,000 plus interest in debt over a 4-year period, which you'll pay off over a ~40 years of working before retirement, you're looking at a $4,000 principal plus interest that you have to pay back every year.
That's an insane amount of money to pay if you don't have a specific job you want to do that requires it.
Nobody is going to argue that going to med school is a bad idea if you want to be a doctor since it's a hard requirement.
But if you have no idea what you want to do or are one of the over 50% of people who don't end up doing work that requires their degree, spending such an insane amount of money is probably not the right choice.
Obviously, if you live in a country with a reasonable education system that is free or far more affordable, it might still be worth going to college/university, but if you're in the USA or somewhere with a similarly fucked education system it probably isn't unless you have a specific plan to make use of it.