This is your reminder that every crypto"currency" using a transaction fee is fundamentally a scam and everything that is happening using them is merely hype to get you involved in them.
Fees are for inclusion of a transaction in a block. And some pretty clever game theory was implemented as part of eip1559 in Ethereum to make fees efficient and fair.
Some semi-centralized infrastructure and development is needed and costs money to run, but the questions unique to each circumstance are: "What do revenue and EBITA look like?" and "How efficiently are CapEx and OpEx used?"
OTOH, if a social venture nonprofit ran a coin with survival in mind rather than get-rich-quick fintech profiteering, it could make a promise to keep overhead low and any sort of profit margins for reinvestment in robustness, stability, features, and auditing controls to a small, fixed %.