I thought Ethereum's primary aim was to be an unstoppable world computer that runs any code where the fas fee was paid, not money. Bitcoin aims to be peer-to-peer censorship-resistant electronic cash---and at this point its protocol has far higher levels of tested security.
Many of these transactions are not using ETH the currency, just Ethereum the network. Ethereum has many tokens such as stablecoins (USD pegged tokens), governance tokens (capital assets), synthetic assets, even wrapped versions of Bitcoin.
Ethereum is still a "world computer", but it's a world computer for high-value transactions, which are generally financial.
Transactions on ethereum get processed from the mempool in order of who wants to pay the most gas to have their stuff processed.
And yes, ethereum has more potential for problems, it's a much more complicated system than bitcoin. Their current goals are proof of stake (getting away from energy wasting mining) and scalability. Bitcoin is great for what it's great for, being digital gold, but it's pretty far from replacing Visa, ethereum actually has a shot at that.
