If you spam /all chat with 'Report [X teammate] every 30 seconds over a 40-minute game....
I'm more liable to report YOUR sorry ass for harassment of your teammate as well as for just annoying the shit out of me.
I can understand if they were intentionally feeding and okay, sure, I'll report in THOSE circumstances (not if they got hard-countered and couldn't recover from a bad start)...but not before I fill out the expanded information box explaining in my own words how detrimental you were, as well.
Say it once, maybe a reminder at the end of the game. Otherwise, just shut it. Saying the same thing over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over...etc. doesn't make me want to do you any personal favours.
I'd mute you but most times I encounter this never-ending requesting of reports, I usually find enemies in /all chat who do this tend to spout off things I can make ADDITIONAL reports for, such as language and hate speech. I want to have further evidence that you are being just as bad, if not worse than whoever you're complaining about at the time.