[0xFreebie]

I've recently had the experience of getting a spam email that allowed the spammer to add an appointment to my Google Calendar without my permission - even though I never enabled such a feature, never communicated with the sender before, and didn't reply or star or have them in my contacts. Wtf.

[MrMember]

Google will automatically add meeting invites to your calendar even if you don't accept them. You have to disable multiple options in both Gmail and Google calendar to stop this from happening. It is default behavior.