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Reddit sells its api for high and is about to go for an IPO, its economy bases entirely on the data made by the users/communities. It is the work of the public, get robbed by a small group of individuals. A living example of capitalism.
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Fediverse isn’t enough to secure the publicity and usage of public data. What if the host of Lemmy instance also releases the snapshots of all the posts and modlogs, everyday, in the form of bittorrent? Only by doing so, we are safe from the host erasing public knowledge and data brokers.
Think of the problem being solved. The Fediverse solves multiple problems, but most notably ensuring that our contributions won’t be paywalled by some corporate grifter. The post and comment data itself is free and open, subject only to TOS and regional legislation.
If you consider your conversations valuable, stick with something like secure messaging application groups. And then hope nobody in that group does what you imagine in your second point.