Google "Lightning Network". It allows for "off-chain" transactions that aren't included in the "7 tx/sec" limit.
https://en.wikipedia.org/wiki/Bitcoin_scalability_problem#%2...
"The Lightning Network requires putting a funding transaction on the blockchain to open a payment channel."
Now, if we put the whole world on Bitcoin, how long does it take to open that channel? Days?
But of course LN makes no sense if you just did what Satoshi said and incrementally increase the block size as needed, but then of course Blockstream cant sell you their SideChain(tm) products.
The whole thing became really convoluted and dumb once Adam Back got involved.