Read somewhere that sometimes it’s best to ask for obfuscation of personal info rather than straight up removal, as a middle ground you can both agree on, e.g. truncating your name and surname in your reviews.
If you’re not in a country with strong personal information rights, try that next; if you are, you may need to contact your local data protection authority to file a complaint
“came out of beta”, though. in the first few days, or weeks, after the official release, there was extensive discussion about the issues and shortcomings of Cosmic, if I recall correctly
edit: whoops, I was too slow