In this space nobody is a fool except you are totally new to crypto and you decide to take a step without doing research, how can a stranger send you their log in information for an exchange and tell you that they are entrusting you with their money and you believe?
How can someone have access to millions of dollars and you are the God sent stranger they can give the key to the millions and you are promised a share part? Do you work for the money?
A typical aging the victim kind of scam. Someone tried that with me back in the day. Coming ate with things like, "I went on vacation to a different country with some crypto ba regulations and wanted me to make withdrawals on his behalf... directed me on what go do of which, I objected because, I already knew how all that was to end".
Either way, it's pretty dumb to hope that, such level of responsibility would be given just anyone. Something I always ask myself;
These individuals that wants to entrust you their life savings worth millions, don't they have relatives or friends that could work that for them?
Why you?
And on your part and I don't mean the OP in all this but,
Why would you hope or want to hold in your possession someone's fortune because your asked to?
It's supposed to scare you.