But Satoshi posted the first text message in the blockchain (bank bailout)...
If you ask me, that was a mistake, but many people (especially BSV/big blockers) will disagree, because they don't see it as a mere payment system.
No, it was not a mistake to quote the newspaper as this was
needed to prove that the Genesis block and further blocks weren't pre-mined.
It was also to my knowledge the only time that Satoshi Nakamoto included such data into blocks he mined. He clearly didn't see the blockchain as something to store superfluous bullshit or bloat it with stuff that doesn't have much to do with Bitcoin transactions details.
IIRC, he released the Bitcoin binaries after the Genesis block (maybe that's why those 50 BTC are unspendable).
His text message was a clear political stance IMHO... not that I mind text messages that much, since they're small by nature, but once you open that can of worms, then people can store literally everything.
Just wait for BSVers to join this thread, they'll show you Satoshi quotes saying he endorsed storing video/audio files in the blockchain.