It was a bundle in a select few European countries. I got my pixel watch for free with my pixel 7 Pro imported from France.
I used misskey for like a year before switching to calckey and can't recommend it enough. Misskey has a lot of questionable choices (like you still can't click on notes to open them like every other software, or the sub-par mobile interface) and it's also the only *key that doesn't support note editing despite everything else supporting it. All in all calckey provides a much better experience.
For mastodon no. Husky was specifically made to be compatible with certain pleroma features (emoji reactions, unlimied attachments, stickers, etc.).
Found another web interface that tries to replicate old reddit
Source code: https://github.com/rystaf/mlmym