The problem with this is that people who want to make money will always be highly motivated to either find loopholes to abuse the system, outright lie about their intentions, buy and resell the data for less (making profit on volume), or just break in.
"Ah, it's free for research? Well, that's what I'm doing! I'm conducting research! Ignore the fact that once I have the data, I'm going to turn around and give it to this company that is coincidentally also owned by me to sell it!"
"Ah, it's free for research? Well, that's what I'm doing! I'm conducting research! Ignore the fact that once I have the data, I'm going to turn around and give it to this company that is coincidentally also owned by me to sell it!"