It’s cryptocurrency, the Stellar Lumens (XLM) is trusted well enough to be in the top 15 cryptocurrencies by marketcap. It has years of history to look back at. It doesn’t have a inflation rate (0% inflation rate now + occasional coin-burns).
It uses orders of magnitude less electricity than bitcoin because it uses distributed databases instead of ASICS, transactions are sent and received in a few seconds (near-instant), and transaction fees are less than 1 cent (just high enough to disincentivized spamming the network). Compared to Bitcoin’s $250 tx fee and Ethereum’s $30 tx fee, XLM’s tx fees are very cheap.
Finally you can buy XLM on most exchanges since it’s been around so long.