I found this, what do you think, precludes live calls? "The Policy: Educational announcements (as opposed to Promotional Emails) are your way to share valuable learning material with your students. External links are allowed in educational announcements, but must contain free educational content only (i.e., non-promotional). You may not direct students from Udemy to other promotional sites where they then would receive coupon codes, be asked to submit an email address before accessing course content, or be prompted to make an off-site purchase of a Udemy course. The Warning Message: External links in your educational announcements must provide free educational content and may not prompt students to make a purchase or provide personal details. Please confirm that this is the case or remove the link before proceeding"
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