UCEPROTECT level 3 blacklist for a DO Droplet. Has anyone heard of this site before?

I’m working with a group that switched their TLD a year ago. I check their old and new IP’s on MXToolbox. The last search showed their old IP Address was blacklisted by UCEPROTECT L3. I looked further and they noted it was because of a DO Droplet.
I’m decent at working with groups like Spamhaus. This site didn’t provide much info, but did say I could get the blacklist removed if I pay for it. That seems not cool. Anyone run in to this issue before?