Yeah, it's trade-off if you choose to run your own testnet or signet. But, you can run your own testnet to avoid centralization on signet. Although it's harder to run your own testnet, partially due to lack of guide.
There is a guide on Bitcoin testnet box ran on regtest mode which is quite an offline settings of testing on the network, which is still not sendable, mainly for personal usage. However, testnet mining may not be a hassle for people who own the necessary set ups and devices, I heard it's not difficult to mine on testnet.
It's your world now, you make the prices what you want it to be
I learned a long time ago that you shouldn't fight or think you are bigger than the
invisible hand in markets.
The invisible hand is probably my best term in economics regarding business, it's actually what controls every market, who buys from who, and the reason customers switch from one shop to another. It definitely works to balance the flow of demand and supply for all who sells a product or service.