These are set and enforced by the tribe.net moderators.
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Be kind.
By that, I mean don't upload a ton of stuff here because disk space is limited and costs $$. If you want to use Mastodon as an archive of your big photos and videos, then you should run your own server. It's easy and I can walk you through it.
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If you want to show off your products or services, you may post an ad once per month. If you are reported for posting more than that, you will get a warning, and then suspension.
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If you send unsolicited direct messages to users, and you are reported by anyone, you will get a warning and set to limited visibility. The second report will result in your suspension.
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Accounts that display ads in their profile photo and description will be set to limited visibility, meaning only your followers will see your posts.
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Also, just be nice in general. I'm doing my best but I don't know everything about Mastodon. The community is a better resource for answering questions, especially if things don't seem to work for you the way you'd like. Remember, this is a free service.