Two things to consider:
1. A large amount of BTC volume is fake volume or wash trading to benefit the exchange marketing. Particularly CoinMarketCap is an extremely misleading and unreliable data source. Their data is totally useless and means basically nothing. It's just a glorified ad site where exchanges pay money to list their fake volumes to get ranked high and acquire customers. Just look at the list of high-volume exchanges in your link and you can see that the vast majority of them are unknown and untrusted little companies inflating or completely making up their volumes.
2. Large amounts of BTC are traded OTC (over-the-counter) and would never show up in such data.
I don't know anything about Apple stock, but I can guarantee you that the $30B BTC figure is totally off. How off? Nobody really knows. It's impossible to get reliable data. True trade volume could be 1% or 10% of that.
Also, why do you care about trade volume? Depending on how it's generated it may not be an indicator of anything. If your goal is to measure liquidity, trade volume is not a good metric to look at.
