Hampering a direct rival, instead of empowering them, while they themselves remain without a replacement during transfer season. It makes absolute sense to do it. That is their benefit - their opponent doesn't get stronger while they remain weaker. And also not looking like small fry kowtowing to the whims of a bigger club - something they aspire to be now. Just because United woke one day and decided to have Ashworth doesn't mean Newcastle should prostrate themselves and deliver him immediately, especially considering he was supposed to be one of the most important drivers of their ascension. It's a cutthroat business - United have the right to chase him, and he has the right to look for other opportunities - but that doesn't mean Newcastle are in anyway obliged to play along and to their detriment. I'm sure there is also them being spiteful, but they can afford to keep him on and pay his wages because they are the richest club on the planet. And on Ashworth's side of things, he should have read his contract better. No one forced him to agree to these terms. And I believe the suggestions this will have an effect on their future recruitment to be unfounded. Like it or not, Newcastle will rise. Anything else is just living in denial. As such they remain an interesting project. And once again, they have the most money, and that's always a good position to be in.
This situation reminds me of the most recent one with Antony - where Ajax were the bad guys and a small club because they didn't immediately submit to Manchester United a couple of weeks before the closure of the transfer window, and demanded an exceedingly high price for their player - something which in hindsight turned out to be the correct move on their side.
Due to this myopic chase, United are now committed, as the club can't just ditch Ashworth after this. So, we wait for this to get resolved, and pray he is worth it.