How easy it is to create a new thread, just put a single link and leave it.
Yeah. PoW is the most effective algorithm of all.
I believe it depends on your purpose. If you want to create a semi-centralized system for your organization, then PoS is probably better.
No! Bitcoin isn't leading the internet based transaction volume! Paypal does! Bitcoin's market cap is 165 billion USD right at this moment whereas PayPal churned out 172 billion USD alone in 2nd quarter of 2019! Bitcoin is still 7 billion USD less! Reference is given below,
The usage of market cap is not right imo. It's better to call it transaction volume. And Bitcoin transaction volume is significant, but it does not reflect what the money is used for. A whale may be playing with his wallets and send 1 billion every minute to consolidate his funds.