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Now that you mention it, I think I read something bad a few weeks ago but I can't remember what it was.
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Start by reading their T&C and privacy policy https://amboss.tech/terms https://amboss.tech/privacy
Then read about their new "services" Reflex https://www.nobsbitcoin.com/amboss-launches-reflex/
Then think again if you are going to use their "services"
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BOYCOTT EVERYTHING THAT COMES FROM AMBOSS YOU HAVE BEEN WARNED.