The main website (www.ntppool.org / www.pool.ntp.org) doesn't set any browser cookies. Some access logs are generated strictly for diagnostics purposes. No long term storage or analytics on user behavior is attempted.
The manage website (manage.ntppool.org) sets a cookie on login to track authentication. The site also keeps a record of the account information you provide and NTP server IPs that are registered. We try hard to not keep any information that's not essential for operating the system.
If you have questions, concerns or suggestions you can post in the development forum, on github or via email.
The sites use a few other services with their own policies or privacy statements:
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Statuspage.io don't set a cookie but may track usage in their logs.