Did blockchain.com stold my Bitcoins?
you should check in history/activity when your btc was sold.
Btc forked to bch and bchscv so your btc became all 3.
if you had 0.2btc then you also have 0.2 bch (at current price that is about the amount you mention)
If you dont recall selling the BTC it is also possible to see what IP address was accessing your account.