i seriously don't get why league is supposed to be a skill game at all

i've been hardstuck platinum since season 4 for 5 years except when i was in the army

my little brother's account is bronze right now and he asked me to rank it up so i'm playing on it

but when i go to bronze, i feed in lane on one or two out of 10 games in a really absurd way

if a player who is so bad that they feed even in bronze has managed to stay in platinum for years, can that game really be called a skill game?

can a game where a top 3% player losing to the top 96% of players is normal really be called a skill game?