Ask HN: Have you been sending GDPR requests out there?

After GDPR was approved, I started sending GDPR requests to my bank / old phone provider (moved from Spain to Canada a few years ago) / Paypal, etc. I also want to request data from Visa / Mastercard, as I would expect that to be a real goldmine. I was curious to know if people here are trying to do the same, and what their results have been. So far, for me, only my mobile phone provider and Paypal responded with a request to send them some scanned documentation, which I did, and I am currently waiting for their response. Also, can anyone point out what data brokers are currently operating in Europe? I'm really curious about those. A lot of the stuff I'm able to find online only talks about companies based in the USA, though I understand their reach is global.