junk memes in a tx can be put by anyone just wanting there transaction in a block

but the ordinals. is where junk memes are put into rare tx spending recent block rewards. meaning a pool has decided to include it in a tx of their reward spending as thats what caseys ranking system is about
these types are called the ordinal inscriptions..

so a ordinal inscription (casey ranked junk meme)  as oppose to normal junk meme is more related to a special handling by a mining pool choosing to add such junk

this does make the mining pool more legally liable to distributing illegal pictures if thats what one of these ordinals is

so pools need to truly be careful what crap they throw into their block templates when collating transactions