I found another Satoshi reaction to uploading videos to the blockchain:
I admire the flexibility of the scripts-in-a-transaction scheme, but my evil little mind immediately starts to think of ways I might abuse it. I could encode all sorts of interesting information in the TxOut script, and if non-hacked clients validated-and-then-ignored those transactions it would be a useful covert broadcast communication channel.
That's a cool feature until it gets popular and somebody decides it would be fun to flood the payment network with millions of transactions to transfer the latest Lady Gaga video to all their friends...
That's one of the reasons for transaction fees. There are other things we can do if necessary.
As you can see, it was not "yes, go on, upload it", but rather "fees are needed to prevent abusing the system". And I wonder what "other things" Satoshi wanted to do in case of spamming the blockchain.