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Never heard of that. I don't see facebook not pulling out of a market requiring it to share posts and such, especially in private groups and whatnot. Seems like users won't like their posts going wider than facebook either.

Facebook can't afford to pull out of the EU, it's a massive market, and IMHO the cat will be out of the bag and other jurisdictions will follow suit with similar regulations anyways.

Technically Signal wouldn't be covered under the DMA ( they aren't even close to being big enough). But yep, that's the point of the new regulation and it's awesome. Forces interoperability and levels the playing field between the huge incumbents with moats and competitors. Oh and it will force Apple to allow third party app stores, so there's that too.

There was a big discussion about that here too - https://news.ycombinator.com/item?id=30799567