The account ownership one is definitely my first thought too. Using keypairs to identify accounts controlled by the user would be great. You can hide it behind a normal looking username with your (or a third party’s) domain on both Nostr and AT (though AT’s not fully developed, but it’s totally in control of the user and doing that with activity pub could hand the metaphorical keys of your account to you instead of the server. Another way would be to allow users to use their own domain with an existing third party server, or use something similar to Zot’s (Hubzilla) “Nomadic Identities” that let you mirror your account on another server.

Implementing quote posts is a little above my pay grade, but I actually think that the link option might be a great idea. Nostr does quote posts by just embedding the post into your post where the nevent is pasted in, making both regular quote posts and the general ability to embed any post anywhere in your post. That sort of functionality, just using links to posts instead of nevents could be neat to standardize into activity pub as well, especially if all the other activity pub software already is doing that. Though again, not exactly a dev, so who knows if that’d break things.

I assume Lemmy and Mastodon are the same way in that they won’t search outside their databases when logged out? If so that’d explain why. Thanks!

Actually one already exists at https://mostr.pub. A dual Activity Pub/Nostr server called ditto is also in the works.

A month or so ago I picked up an 8gb model and it’s been really nice, I wrote a blog post about it if you’re interested and have been really happy with it. 4gb is enough for note taking & code writing, web browsing, reading, and YouTube watching (at low/mid resolutions) and I actually got away with those on a 2gb RAM 16gb storage Chromebook + Debian for a while. Still though, if you can spring for 8gb of ram that will be helpful, and a necessity if you want to do things like run waydroid.

Gnome works great, just be sure to set up the on screen keyboard and run the custom hot corners plugin to make it work everywhere. Also, I know that chromium doesn’t have the best reputation in these parts, but you’ll probably need to use either a WebKit or chromium browser for their touch controls and PWAs.

I went with Debian, but I can’t imagine Fedora offering a much different experience. Mine worked fine without a surface specific kernel, but results may vary from device to device.

Last, I bought mine used for $99 US on EBay. Not sure how it varies from country to country but at least in the states you can find older surface models in decent condition starting at $70 US or $100 US for ones in like new condition with a keyboard & charger.

Edit: beyond Surfaces, if you’re deal hunting and don’t mind more research I believe most 2 in 1s running Windows or ChromeOS will accept a custom OS.