Honey pot to prevent SPAM

I posted this earlier, but perhaps not in the right feed.

We received some SPAM meeting invitations. Since the contact information (name, email, phone) are not auto-populated with the recipient's info, someone can enter info and create SPAM invitations. Also, since the meeting invitation is a link, the link can be forwarded to others or used by bots to create SPAM.

Two enhancements might help:

1. If the contact info could be auto-populated with the recipient's contact info from the Person record.
2. A honey pot to prevent bottoms from completing forms.
3. Other ideas?