That's a good indication that it is not decentralized ;).
One of the weirdest trends I’ve seen in Web3 discussions is the insistence that better alternatives exist, but for some reason nobody is using them, talking about them, or even naming them in discussions.
https://moralis.io/ and https://www.alchemy.com/ are Infura alternatives
You can Google "metamask alternatives" if you want, there are lots. I won't vouch for any of them.
There are many, many WalletConnect https://walletconnect.com/ compatible wallets that can be used with most dapps as well. There are close to 100 of these: https://walletconnect.com/registry/wallets
As for RPCs, here's a list for you: https://github.com/arddluma/awesome-list-rpc-nodes-providers
If you want to run you're own RPC node, it's not so hard as there are docker and docker-compose images that will let you get geth (or nethermind, or erigon) that will let you spin up an RPC pretty trivially.
The more important thing for decentralization IMO, is that you can reasonably switch, even if most people don't. Think about how this plays out in the browser or email markets and compare it to how much of a difference that is to completely locked in services like Facebook.