From their privacy policy:
> We may disclose information to current or future affiliates or subsidiaries for research, marketing, and other purposes consistent with this Privacy Notice.
Furthermore you could self-host, if you don’t want to trust Calendly. calendars are somewhat problematic privacy wise. Especially considering if this gets extended with support for other calendar systems than Google.
Your wording sounds like there should be only one tool for any given problem.
When you have an open source project, you always know what we do with your data, which is very important nowadays. Also apart from that we have small feature that aim to improve user experience when creating or accepting invite. In this case we show their own events in calendar so they have an overview of what are they doing during the week.
It’s a fun project, also I open sourced the infrastructure part so you can self host too.
I think others has add more good points too