yes it is 2FA transaction, i tought 2FA is just a security measure thats why i created that kind of wallet. It seems that you are right...but 50 bucs fee is just insanse. I use many apps with 2fa and there is never an additional fee, to me this is just a blackmailing from electrum. Very disapointing.
Electrum dispalyed a message about the additional fee you will have to pay to trustedcoin when you were creating your 2FA wallet, but you probably ignored it and clicked on "Next" without reading the message.
Electrum 2FA wallet is a 2 of 3 mutli-signature wallet and when you make transaction, the 2FA provider (trustedcoin) must sign your transaction as the co-signer. You can't really expect them to provide the service freely.