Looks like Big Sur is calling home:
https://www.msn.com/de-de/nachrichten/digital/big-sur-hebelt-firewalls-aus-um-daten-an-apple-zu-senden/ar-BB1aZjXb
trustd process connects to OCSP server. On Big Sur, trustd is in Apple's "ContentFilterExclusionList" meaning firewalls can't block it:
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