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Bitcoin, Bitcoin Cash and Ethereum (and probably other coins) all work over SMS. They are actually substrate-agnostic. You can technically deliver your transaction to a node with a pigeon, as long as the node accepts pigeons.

You need to process incoming transactions as well. It's inconvenient to receive the blockchain over carrier pigeons.

Circumventing censorship is always inconvenient. That is the point of censorship.

Counterpoint to this is that the internet is the most censorship-resistant network the world has ever seen.

There's also TxTenna (https://txtenna.com).

Well if Blockstream satellite proves to be a profitable endeavor then you can expect competitors to come.

You can also expect different channels of propagation to emerge if demand builds up.