I'll not point it out that they are exchanges as it was mentioned by others here.
I use an offline wallet (myetherwallet), as they say.
Recently many online platform got hacked

Nah, it wasn't hacked. You guys were just victims of a phishing link and that's the problem from these people who complains the wallet was hacked but they never admit they fall for a phishing link.
I fall on that once and I know how it is, now I check the link twice before I type my username and pass, we need to get burned to know what fire is.
Even after so many threads about not keeping money on exchangers people still do it, after so many warnings about phishing links people still don't pay attention. They will learn when they lose money, I had luck and I didn't lost nothing but I learned good how to be keep myself from trouble.
Myetherwallet isn't an exchange nor trading platform but it is a plain web wallet for Ethereum and ERC20 tokens. I'm sorry to know that you've fall for those links, they are everywhere as the price of ethereum, bitcoin and other altcoins are surging so you just need to be aware on it. We can't blame those people that aren't paying attention on it, they are too confident that they won't be hacked.