Portal is a guaranteed hourly spawn and the Oxa are random spawn(rare) every 4 hours. But I guess every little bit helps.
I keep hoping for multiple drops of ore, but I guess S8 is firm on that.
I think it will come down to how much money players are willing to spend.
And since people aren't spending as much on other entertainment, such as eating out or movies or clubs..... that may be their marketing ploy.