Calling for reports is already against ToS and |unsportsmanlike attitude"
Calling for Reports is counted as a form of Harrassment. Harrassment is reportable.
It is also known as "Report Soliciting" which (as far as I have been told in support tickets) is against the ToS
If someone is doing something reportable, report them.
But you are not allowed to use the report function as a bludgeon to beat people over the head with it, Nor are you allowed to turn it into a witchhunt by "/all Report X for...."
So yeah, if you want to report someone, fine, do it quietly and by yourself. But you are not allowed to dogpile the other players onto 1 person by calling for reports from the other team.
Thats why people do it so often. Because no one calls them out on it. No one tells them that by them calling for reports on others, THEY THEMSELVES have commited a reportable offence.
So Reports: Keep it silent, Keep it to yourself. Gonna report? DO IT. But you arent allowed to sick everyone else in the match on one person.