I think you should take a deep breathe. Check your web wallet balance first on blockchain if there is any outgoing transaction.
If you do not have your wallet address- click on receive in web wallet and you can find your address and check it in block explorer.

Regarding your allegations -  I do not believe any one kept their large holdings in web wallet considering it does not support staking. Further, you can check the Developer fund and the bounty fund and there is nothing outgoing in last few days. so keep calm.

Rather, take this moment and gather Twist for the soon to be announced Twist Nodes.