What abt tx fees? It's not free to send bitcoin. 100$ transaction might cost upto 21 dollars in btc. I believe 10% is low.
Oh really??!! I have tried to check on coinbase and I noticed about 0.27$ fee only to send 1000$+. But I am surprised to see that you have mentioned 21 dollars to send only 100$. It is nothing but ridiculous. You may check the evidence by clicking
Attach?