Your instinct that there isn’t a “go-to” place for all data is correct. Not sure about GDPR barriers, but it seems likely that a lot of things became unavailable (or were never available) because the people running those projects just got caught up in other things.
Fortunately, we have mechanisms for funding useful projects that no existing person maintains yet. If you’re really interested in sorting through everything and making it available, that might be a good candidate for the EA Infrastructure Fund. And if you’re busy with other things, you can even propose that they pay someone else to do this!
Your instinct that there isn’t a “go-to” place for all data is correct. Not sure about GDPR barriers, but it seems likely that a lot of things became unavailable (or were never available) because the people running those projects just got caught up in other things.
Fortunately, we have mechanisms for funding useful projects that no existing person maintains yet. If you’re really interested in sorting through everything and making it available, that might be a good candidate for the EA Infrastructure Fund. And if you’re busy with other things, you can even propose that they pay someone else to do this!