It seems that binance have problem with their 2FA, many people account is locked for weeks without respond from binance.
https://www.reddit.com/r/binance/comments/7iceev/attention_issues_with_2fa_please_read/#bottom-commentsmany more complaints.
I use Binance, I like it and I think BNB is a great idea.
I do wonder how Binance will handle increase volume and what is stopping them packing up shop and disappearing with all the loot. Yes, I know don't keep your coins on an exchange, but anyone who is trading even a bit does keep a little on as makes it easier.