Considering the popularity of the Harry Potter film series, one can logically assume that there are other plans in motion to put the movies back on Peacock in the years to follow, and once NBCUniversal’s deal expires, you can be sure that WarnerMedia will want to put the movies on HBO Max as soon as possible.
It’s also worth noting that just because the Harry Potter movies are gone from streaming now doesn’t mean it will stay this way for a long time.
Reportedly there are plans to put them back on Peacock “in windows” throughout 2021.