I don't know how you'd support or discredit such a view but I generally feel like the free flow of information has been overall positive.
Not uniformly so, but even the bad stuff say Nazis, was already there and mostly brought into the sunlight.
I'm reminded of something I saw on the internet long ago, which compared a Time magazine piece about "life in Iran" which was all black and white photos of war murals, and contemporary Flickr photos from Iran, which was just normal people stuff, in color.
Can't find it now, but here's a conversation on Flickr in 2007 that kind of sums up the same thing of "Iranians are normal people, like us", "I know, I'm Iranian":
https://www.flickr.com/groups/onthestreet/discuss/7215761559...
And here's someone who made a Firefox extension around the same time to work around the attempts to block flickr:
https://advox.globalvoices.org/2007/02/14/iran-flickr-users-...
Iran isn't currently some Disneyland, but would it be better or worse without the internet? I vaguely feel there's been a positive impact.
I know it was fashionable to get excited about the Arab Spring and then fashionable to be cynical about it all, but I feel like in one of those hype cycle things, the long term impact is being understimated, even as some overestimated the short term impact.