I came across this meme and its too funny not to share. Miners are creating spam ordinals to create fake traffic jams each time the rate fee drops quickly 
I don't know how you arrived at the conclusion that miners are behind ordinals. I don't actually believe that to be true only there are substantial evidence to support that. What I think is that miners just saw opportunities in it and are benefitting accordingly. They may not be behind it, it could just be the handwork of people that want to leverage on the popularity of Bitcoin to scam people of their money in.exchange for digital jpeg. I agree that there is no solid proof that miners or pools are behind these ordinals but I do think that some pools/miners are spamming the mempool by dust transactions with higher transaction fees. I had seen several $0.25 transactions getting listed on mempool site with higher than the usual transaction fee. This makes me think that someone is trying to bump the competition for priority up with a small amount of transactions.
The thing is that I think that it is some pool or miners bumping the tx fee because they are the one who gets the benefit when the price if tx fee increases but I don't say that they are the ones behind the oridinal spams.