yeah, sometimes it vibrates when there's no notification.. which is extremely weird since i have internet access and notification blocked for about any app. Haven't looked much since it's not so often tho.
not sure about win/mac, but for android yes they do keep record of stuff like what apps are being launched and upload/sync to google account. it's not hidden though.. it is(was) literally available on google account history or something (was about 7 years ago)
it's not perfect, it loses tons of data for some reason. there's also pretty much no way to properly archive documents in google docs (their history/metadata)
Fennec is just upstream firefox with a few patches applied during build afaik, so they probably forgot to remove what upstream added. Nothing to worry about imo.
same, i just say I don't do instagram and tell them my local whatsapp equivalent's id or phone number. I've tried using instagram a few times but it can't be used anonymously at all.
lemmy, hn, reddit, bsky