This is what they say:
Simple and privacy-friendly Google Analytics alternative
Plausible is lightweight and open source web analytics. No cookies and fully compliant with GDPR, CCPA and PECR. Made and hosted in the EU, powered by European-owned cloud infrastructure 🇪🇺
Also, you pay with real money for what they offer. €7,5 per month will give you the ability to report 10.000 pageviews; €15,83 per month will increase that to a 100.000.