One way to think of this is that a group of Chinese miners just gave over $50K away to other miners, to reward those other miners for checking the block versions before building new blocks.
Terribly nice of them, really. Though I'm sure they'd prefer to've collected the prize themselves, it's nice of them to "support" those who are doing a better job than they are.
So, for a few hours, if you were mining and actually checking blocks for validity, you were getting about double your usual rate of return.
"SPV mining" is one of those silly ideas like "virtual memory" or "virtual sex" - the real thing is always better.
that's not what happened the 50k he Chinese miners made wasn't given to anyone else they were unmade while the other miners got exactly their normal prize with less competition because the Chinese were mining invalid blocks