Question #1 - how often do you buy crypto with fiat?
Not that much this time because as we can see, the market starts to shape up and I don't think buying at this time is an ease for me. I always think before buying and that would be during the greatest dips comes.
Question #2 - how do you choose the platform? Are there any other criterions than the amount of fee? Security, speed of transaction, simplicity, friendly service?
Exchanges that I always use. I don't change the exchange that I use if I'm already comfortable to it. I think about the fees but if the support is great I think of it as an incentive.
Aren't you afraid that your personal data may be stolen or sell somehow?
Everyone is afraid about this situation that's why as much as possible, we're avoiding KYC exchanges but if you really trust that exchange and you think that they can keep the record well that's not an issue for you and you make them as an exception.