ReCAPTCHA Alternative

I don't understand privacy-focused companies (with GDPR) statement who don't reveal where they're located. No postal address, no mention which jurisdiction it is under. How can companies judge who they're dealing with, basically who they're trusting their user's data with?

Somewhere on https://maileroo.com/terms-conditions a related project, I find "and you expressly consent to have your data transferred to and processed in Germany." If it's Germany, then the website needs an imprint.

AuthKong.com, as an alternative to Google reCAPTCHA, offers robust and cost-effective security solutions for webmasters in light of reCAPTCHA's recently announced pricing changes.