Edit: Also, Satoshi explicitly said something about uploading videos:
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.See? The answer was not "just use OP_PUSHDATA4, and upload it". The answer was "fees are needed to discourage that". And even more: "if fees will not be sufficient,
then we can do something else to limit it further". That's what he said, as you can see above, and click on the link to the quote to confirm it.
.. some trolls that dont want junk to stop. think the only way is fee's
they also pretend the only way via fee's is everyone pays more equally..
there are many other ways to limit it. such as adding rules to opcodes to limit length(remove assumes and add conditions). and also penalise just certain opcodes for using certain opcodes. multiply base fee by 2000x much like they multiply legacy by 4