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There were some concerns that posts by people on their own servers would be used for advertisement, abused, indexed, datamined, etc. by commercial services connected to the social web.

That would be bad. You should have control over that. Granting a person on a server the right to read or view your posts should not grant that server's operator a right to use your content for whatever they want.

We should have better support in ActivityPub for saying what you do or don't permit with your stuff.