I know that I recently linked to an earlier video of the Gentle Living Shop, an ethical creative channel, but they just published a video where they announce that from now on they’ll publish on PeerTube alone and stop publishing on YouTube because of it’s unethical behavior. PeerTube surely needs quality content creators that publish exclusively on the PeerTube network.
In theory it’s not indeed, the is indeed shared between multiple instances, but in practice it’s much better.
Since it doesn’t rely on advertisement and is fully open source, the fediverse has very little tracking, and no one uses its data for advertisement. It’s also not full of the dark patterns that are often used for tracking. In the end your data is much less abused than on other platforms. It might become an issue though if an ad corporation starts running their own instances and federating with everyone.