Where's the basis? Just because most of us here are using it that will your assumed statement regarding on who's the market leader when it comes to web wallets?

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There are still some good web wallets out there that you can use, I prefer to get with greenaddress and I tried it out before and if something happened to blockchain.info I'll switch back to it.
Also refer to these wallets https://bitcoin.org/en/wallets/web/