Have you checked out RIPE atlas?
Volunteers run probes and earn credits. Credits can be shared and spent to run measurements of their custom design. All measurement results are public info (I’m pretty sure, it’s been a while since I did stuff with RIPE atlas).
So all that nonsense about credits and volunteering may not matter to you if the results are useful.
https://atlas.ripe.net/
https://en.m.wikipedia.org/wiki/RIPE_Atlas