They have a duty to moderate public-facing systems. This is a link/bookmark sharing system, so obviously bookmarks that are pointing to things that are illegal are going to be dealt with.
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OP claimed it’s his private bookmarks not facing public
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the site doesn’t contain any illegal content. It’s just google being overzealous and intrusive
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Google Keep Notes has a sharing note feature. You think it would ok for them to sniff what you noting and delete it if they didn’t like it?
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one again - there’s nothing illegal on that website, nor is accessing it or sharing it’s address
They don’t have to, they choose to. You can share bookmarks on Firefox, but Mozilla doesn’t filter nor censor them Orwellian style.