I'm not sure a company that says "Imagine being able to capture, analyze, and re-target any person on any ad platform that clicks on any of your links on any marketing channel" is one that should be trusted with anyones privacy.
This URL Shortener service is also GDPR compatible as retargeting pixels are not set for EU subjects regardless of what customers want to set. In the roadmap is to add an opt-in message on the redirect.
Btw, Share Count Proxy is also whitelisted by Firefox which provides the added advantage of share counts actually showing on Firefox if you use the proxy while direct calls to Facebook.com, Pinterest, etc are blocked.