I find the malware storage viewpoint to be absurdly unhelpful, although I do not dispute its underlying truth. The same arguments might be made about a stack of blank paper or the patterns formed by a number of stars in the sky when viewed from exactly the right perspective.
Any substantial string of bits can be turned into CP when passed through an appropriate hashing filter, and conversely any CP can be hashed into an image of Mother Teresa or whatever.
A reasonable solution in such cases will never be found in banning or regulating the medium of storage, imho - it's just makework and/or an excuse to meddle.
If I recall though some messages would not be seen to standard users of the blockchain since they would be non-standard txts to send the data
But anyways your right it's more less an excuse to try to meddle with the system itself, can't really control or isolate any single txt without blocking every participant in the system or sieving every transaction to go through it.