In other words, no one needs a PeerTube account unless they are making videos.
A noob question from someone who only has an account on a Lemmy instance: I check Mastodon most days and PeerTube occasionally. Federation is great in theory, but in practice it doesn't work between all kinds of applications. Are there Lemmy instances where an account actually makes it possible to follow or comment on Mastodon or PeerTube? If so is it widely implemented? I think I read something on my Feddit instance that hinted at that it might be made possible to federate from there to Mastodon some day in the future. The other direction probably works to some extent, but I haven't really had any interest in signing up for Mastodon as I'm not planning to micro blog myself.
I can subscribe to PeerTube channels through third party apps of course, but not comment.
I recently bought an inkBook Focus Plus (black and white Carta 1300 screen, 7.8"). For me a strong argument was that I needed the reader to support my local library's book lending app now that they are moving away from Adobe-based DRM due to the upcoming EU directive. So if you plan to use any library service, make sure to check their technical requirements. It can vary even within countries.
For file transfer the reader has WiFi, USB, and a memory card slot. There is also an individual email address you can use to send books to your reader. Wifi drains a lot of battery so don't keep it on unnecessarily.
You can install Android apps from APK files. There is a built-in "app store" called inkPLUS so you can easily install from a short list of recommended apps. You can also install APKpure which is another source of apps, like an app store. I've installed apps like Pressreader and Deepl translate. No problems.
The built-in pdf reader leaves a bit to be desired, such as margin trimming for texts. The built-in book reader is ok but one problem I've found is that the clickable list of content is truncated after 50 items. This probably doesn't matter for most novels etc, but it's a big drawback for many textbooks etc. It's possible to manually add bookmarks. I would also have wished for some "back feature" like keeping a thumb in your physical book and going back to the page you were perviously on. As a Nordic person I think the list of supported languages could be more extensive if they want to be truly relevant in all of Europe. The file system is a bit opaque and it's not at all easy to move documents.
There are physical buttons for page turning. They work for the built-in apps but normally not for third-party apps in my experience, and the buttons are not programmable as far as I know. So in those cases you have to tap or swipe the screen.
Bloatware-wise the built-in translation is based on Google translate. I've installed the Deepl app. It also has Google cloud available. I honestly don't remember if it was preinstalled and I uninstalled it when I first got the reader, but it's anyway available in the inkPLUS list if apps. But if you don't plan to use it you don't need to link the reader to any Google account. I log in to my local library account to borrow books or to use Pressreader.