What you need to know about Luno eWallet.

[terrymoore2000]

Send and receive Bitcoin network fees

Due to increasing Bitcoin network fees, a fee of BTC 0.0002 will be charged for all send and receive transactions using a
Bitcoin address.

Free alternative: Alternative means of sending bitcoin using Luno without any charge fees...(read more)

http://lunoguide.com/updates/2017_lates ... -fees.html

[bitkilo]

Send and receive Bitcoin network fees

Due to increasing Bitcoin network fees, a fee of BTC 0.0002 will be charged for all send and receive transactions using a
Bitcoin address.

Free alternative: Alternative means of sending bitcoin using Luno without any charge fees...(read more)

http://lunoguide.com/updates/2017_lates ... -fees.html

That is just not true, some online wallet provider are now passing on the transaction fees to their clients but you shouldn't really be storing any bitcoins in an online wallet anyway.
If you store your bitcoins in a wallet that you control the private keys to then you select the fee you want to pay.
Fees are not mandatory to broadcast a transaction to the network but if you want your transaction confirmed it's best to add the highest recommended fee for the best chance to be included into the next block.

There are a couple of site around that help you to calculate the correct fee to add:
https://bitcoinfees.21.co/
https://bitcoinfees.github.io/
http://bitcoinexchangerate.org/fees

[Crixus]

The link is not working anymore...