Does tiger brokers charge commission for selling?

Usd 1.99/trade 🙃

Signed in everyday and save the coins to exchange for stock vouchers/ commission-free trades

Generally, brokers charge commission per trade, which include buy and sell trades. This is true for most, if not all brokers. The commission for buy trades is typically the same as the commission for sell trades.

If you use a commission-free brokerage (e.g. TD Ameritrade), buy and sell trades do not incur commissions. However, they may levy a SEC fee of 0.00221%, which brokers normally absorb through commissions.