understand the word FULL
You are just giving your personal interpretation of "Full Nodes".
That said, we can't stop ordinals because we'd have to censor the network, make it more centralized. Ultimately people decide what they want bitcoin to be and if the majority wants to upload their stuff to the network, that's what's going to happen.
Satoshi didn't invent Bitcoin to see what it turns into in the future and say "what the heck, it turned into a cloud storage that died afterwards". We also didn't adopt bitcoin thinking it can turn into a shitcoin by letting people who don't even run full nodes themselves upload garbage to other people's computers!