We previously had a Zoom Phone account. They made us go through the campaign nonsense, though they provided considerable help. For example, see
My first attempt was rejected but support provided additional help. Per their advice, I set up the ‘privacy policy’ link to say:
No mobile information will be shared with third parties/affiliates for marketing/promotional purposes.
All other categories exclude text messaging originator opt-in data and consent; this information will not be shared with any third parties.
We do not sell any data to any third parties.
and also added a ‘contact us’ link with a phone number and email address.
The campaign was then approved. Luckily, this all happened before they started blocking messages.
The Zoom account had an issue unrelated to SMS and we switched to Intermedia Unite.
There, we signed an agreement stating that all our messages are conversational and we will not send any by automated means. They allow SMS and MMS without a campaign.