The O&O's have been playing with the scheduling for the past 3-4 years now. It started with WWOR shifting House and placing The Simpsons on Thursday nights. KCOP followed after, then WPWR. It has kind of snowballed from there. I haven't kept up but, I'm 95.7% sure more than half of the MNT O&O's are running programming out of pattern now.
And, really it goes back a little further than that if you look at MNT affiliates as a whole. Fox started loosening the reigns on branding/standardization around 2011-13 if memory serves me correct. And, the allowing more stations to run out of pattern followed shortly thereafter. The affiliates realized that the "My ___" branding really didn't hold much value. The O&O's are just starting to realize what a lot already knew.
MNT the programming service will be around at least another year. And, I wouldn't be that shocked if it hangs around for some time after that. IDK It may become an unbranded service. But, it's cheap to run and allows affiliates to fill 10 hours of real estate a week in one fell swoop. So, it does serve some purpose.
Sure it's a crap load of off net re-runs. But, what would most of these stations fill that time with anyway.... off net re-runs. As noted above it's the branding that's garbage. It's a vestage of Fox's purchase of MySpace. If your a sister station (like the O&O's) and people view your station as a dumping ground for leftovers and second runs, etc of programming on the "senior" station then why not go whole hog and leverage that "senior" station's brand. And, generally speaking that "senior" station's brand holds a little more value. If you're going to attempt some sort of brand extension/brand synergy it might be best to use an established brand versus some flavor of the month website that will fade into obscurity almost as quickly as it came into being...just saying.