Damn_Underscore posted...
I think things like education and technology give you the tools to become more intelligent, meaning you are able to think more deeply about things.
But you can also argue what intelligence is because that still may not translate to higher IQ test scores
What's probably the most salient factor is that the easier it is to find information, the less you end up developing your ability to find harder information or synthesize it yourself. This video does a decent job of summarizing that point (the whole video's worth watching, but you really just need the first 3:30 or so for the purposes of this post):
https://www.youtube.com/watch?v=QEJpZjg8GuA
The bottom line is that finding answers to questions is a skill. Figuring out where to look, extrapolating from partial new information, forming connections with existing knowledge... all of these can be said to fall under the umbrella of "intelligence." That intelligence is something some people are innately better at than others, but everyone can cultivate that skill with effort and practice. Conversely, though, if you don't cultivate that skill with effort and practice, you get worse at it.
Modern information technology heavily emphasizes algorithms and other tools that predict what you need so you don't have to look for it. On paper, that seems really convenient and awesome, and in some ways it definitely is, but in practice it means people are able to find answers to their questions without putting in the effort and practice that would develop their intelligence. That means they do less thinking to cultivate their intelligence, and those skills atrophy.
Now, arguably, figuring out how to leverage algorithms and AI and whatever to give you the results you want is itself a form of intelligence, in that it's a skill in its own right. That's a form of intelligence that most traditional measurements aren't going to pick up on, since it doesn't fit nicely into existing models that measure people's ability to find associations between data points and extrapolate from incomplete sets. There's merit to that argument, and there's merit against it. Defining "intelligence" is a debate that's been raging for as long as humanity has had any concept of what defining "intelligence" might mean, and throwing in something that's changing the landscape as rapidly as information technology in all its forms has only done more to muddy the issue.