Please don't click any links you receive from slack groups like shown below.
I was trying to add eBTC tokens to my ETH address, I received this email from slack group (pure fake) and lost 3.5 ETH and eBTC token airdrop from my wallet. I generally don't trust these sort of emails but it came in right time while I was trying to add tokens and I've logged into it using my private key (worst decision ever made in my life) don't know how I got trapped into it.
I know lot of pro. people don't use web wallets but I learned my lesson in an expensive way. Just posting here for newbies, don't want them to go through this like me.
Pic of the email I've received.
I can't forgive myself for doing that to me
Im sorry for you man
I also received the email but ignored it, since well, there is no upgrade to do on a web wallet.
OTOH, Ill still use my online wallet (mew).
You could have received a link with a fake desktop wallet (from a cloned website) and had the same thing happening to you btw.