If you happen to be an active trader or know people that trade actively, you will notice that traders do not easily give out money ( i.e lend out money) not because they don't have to give but because their capital is actively and most times always involved a trade.
i have experienced this thing 3 years ago, well that was my fault anyways because I lent the money to stranger. I'm fine if they gave me regular updates about their funds but the ignorant feelings on that person and a habit to scam could be the reasons why they didn't give me the updates. This is why people will be more selective when lending money to strangers because these stupid people exists.
Lending to someone you know is different scenario and you would treat it differently.
Lending someone you know gives you more confidence but lending it to strangers have different trust level, together with risk and
so many things to consider before allowing your money to send to other people.
In the side of traders, they are there to continue growing their investment, why should they'll lend it if they have the capabilities to invest with the right assets and collect good amount of earnings.
Less hassle if they managed to keep rinsing and keep increasing their investment.