You either get a 5000, 10000, or 25000 reward. It’s random which challenge you get per day, but each account will get the same total reward during the duration of the event. No need to get your knickers in a twist.
But anyway. with 10/25/50k reward it’s worth to complete the task
Now it’s not.
2500 for single kill. (which most common task)
10000 for 5 kills.
20000 for 10 kills. (maybe, i dont get this task yet)
Even if we imagine that we get at least 50% 50/50 of x5 and x10 tasks it gives us even less SP/month than if we would got only x1 task in previous Killing sprees.
And IRL ofc you dont get 50% of x5 and x10 tasks.
In worst case scenario you get only 75000 SP wich equal of ~1 day training for character with +5 implants.
How do you think, 1-day boost is worth of month of daily routine?
I think answer is more than obvious.