I think there is logic here. U2 is an established band. Maybe the most established band.
They will get a huge initial amount of attention, downloads, views, streams, etc...
enough for them to chart the first week in a (hopefully) respectable position. The next few weeks they get radio add ons, continued, but more modest streaming and views, and hopefully go up the chart instead of dropping after the first big week.
Just a thought.
Singles charts come out on Fridays now.