My son goes to a school that has heavy restrictions on what they can/can't do as well. Sometimes he complains that the school's attempt to keep them safe while online restricts his access to things he needs to be able to do his work fully. When he ran into this situation, he talked with his teacher, and also with the IT team at the school and made a case for why the restrictions were too restrictive.
Unfortunately for him, the need to keep other kids' experiences safe online and the responsibility that the School has to make sure that "inappropriate content" is not accessed on school devices or by students/minors attending the school outweighed the individual student's need for access to whatever it was he was trying to research. You're going to find in the real world that there are content filters and restrictions on most, if not all, business networks and public networks found at places like libraries or community centers.
Remember the person providing the access to the internet has a responsibility to try and make sure that the people using those devices are not committing any crimes or doing anything "inappropriate" with them as well as making sure that "inappropriate content" is not made available to minors etc.
That being said, you've had a firsthand glimpse of some of the challenges that are faced every day from people in other countries like China for example. The internet there is not even close to as "open" as the internet that we have here in the US.
My son wound up using his personal cell phone to research what he needed. Since he was not on the school network and not using a school device he was able to search for and find the answer. Not ideal in any way, but in a pinch he used creative problem solving and critical thinking to come up with an alternative.
Good luck in your studies!
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