[2020] The "Watch Rewards" missions for viewing League's current competitive season are miserably unreliable

First, you have to watch it through riot's dedicated little app - any other streaming service showing games doesn't count.

Then you have to dig into the archives of the internet to find out which leagues actually count towards mission completion; most don't, even though it doesn't officially state which ones to watch anywhere on official media.

Then you have to hope that the scheduled game is an official game and not a scrim or other broadcast game that doesn't count.

Then you have to watch 10 uninterrupted minutes; which given the quality of the service is unreliable.

Then, finally, you have to hope that it counts because ~2/5 times even with everything else right, it randomly just doesn't count it at all.

Why is the system set up like this? I don't mean to call shenanigans, but is there any valid reason for making it this convoluted and unreliable except to get people watching more games than they otherwise might?