One single .jpg spread between multiple blocks and links to websites that for the most part have been shut down already.

Is not the same as.

Being able to upload images and short videos directly.

According to your article Interpol identified this as a potential threat back in 2015.

The blockchain has already been forked over this before.

It's inevitable that once enough people update to core 30 that the blockchain will be forked again.

Even if you removed the threat of illegal material and malware it comes down to cost.

Cost to build and run a node, higher fees to spend sats.