Let's talk about Ethereum's development history.
On July 30, 2015, Frontier, the first version of the Ethereum mainnet, launched.
To be honest, I only learned this later: before and after major upgrades, some platforms temporarily suspend deposits and withdrawals, so leave yourself some wiggle room when planning your funds.
$ETH has been Ethereum's native currency for paying gas since the mainnet launched in 2015.
Understand the principles before taking action, and don't place orders on impulse.