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I agree. I’d even be willing to regularly donate to a foundation that would have this aim as their goal and have their acts matching their promises.
Although, not necessarily a new engine. Going from scratch is a good way to remake a lot of mistakes, while reusing old code is a good way to keep old debt. That’s not a decision I would like to have to take.
You don’t need advanced scanning technology running on every device with access to every single bit of data you ever seen to detect scam. You need telco operator to stop forwarding forged messages headers and… that’s it. Cheap, efficient, zero risk related to invasion of privacy through a piece of software you did not need but was put there “for your own good”.