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Proton and Standard Notes are joining forces
(proton.me)
This is a most excellent place for technology news and articles.
I'd encourage you to check out SyncThing; it works great for syncing pretty much anything: I use it for my Obsidian notes and for my KeePass vault.
I currently use BT Sync/Resilio, since it supports selective sync without fiddling with an ignorelist, but it does work, except on Obsidian's iOS app, which supports only icloud, or Obsidian sync.