I don't condone it. It's just not really costing the company much of anything. The people who would engage such poor quality stuff are also not generally the type who are going to buy anyway. And many people who do go for the better quality PDFs do so to see if they want to buy the print product or to get a PDF version of the print product they already bought.
Generating ill will(albeit minor) in order to stop not much of anything isn't a great look for a company who has destroyed trust in a major way not to long ago.
As well as this, which is more likely to have an impact?
Someone stitching together a fuzzy PDF version of the Player's Handbook from screenshots provided by YouTubers?
OR
A clean PDF version of the Player's Handbook created by someone who buys the GenCon version provided by WotC themselves off of EBay?