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Why you didn'like binance? Is bringing the app to the user's a bad idea? I mean what's wrong with that.

I think Binance is fine. You can do a lot there.
And their programmers are good too.
But the aggressive marketing department really gets on my nerves.
In EVERY program or website that has something to do with crypto-currencies, you ONLY see advertising from Binance.

That's why I love using smaller marketplaces (like Bitvavo) - they don't have annoying ads in every program.