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Signal forks can have unexpected behaviours like retaining deleted messages and also they don’t get updated at the same rate that Signal get updated.
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Every couple of years I hear a story about hackers disturbing signal with backdoors, which would be impossible or very hard to be done If they blocked third party clients. (Ex: 1)
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The amount of people who use third party Signal clients are very few anyway.
I saw what WhatsApp did to forbid modification of it’s app which works in stopping a lot of distributions, why doesn’t Signal do the same?
There are ways to save messages before they are deleted even if the stock app is used. Do not ever rely on this feature to work in a “safe” way.
That is a problem the users who prefer 3rd party clients have to deal with. Obviously if you care enough to not use the official build, you of cause have to take care of using a trustworthy source. That is not “your problem” though.
That sounds a lot like “I don’t use it, so none else needs it either” argument. In my opinion, none of your arguments above are a good reason to combat 3rd party clients.
That’s a lot of flack from an application which refuses to distribute itself outside the play store.