One of the parties involved in a call recording it is not surveillance. It's comparable to having chat logs for text messaging. Contrary to what you've claimed, vast majority of US states have one party consent for call recording. GrapheneOS Foundation is based in Canada where one party consent is the law.

Our feature is designed for people to comply with the law in jurisdictions requiring two party consent. It shows a notice for every inbound and outbound call where call recording will be enabled. It also has a per-contact toggle for enabling it instead of simply being either enabled or disabled. We also plan to offer the option to have it automatically disclose the call is being recorded.