Fun fact to avoid OW if you only plan on raging around once a week;
Step 1:
Join a competitive match, wait until warmup ends.
Step 2:
Call a timeout. If you can't, I'm sure you can miss a round.
Step 3:
Click 'Abandon' but don't 'Confirm' that. A little screen asking if you want to will appear.
Step 4:
Click 'Reconnect' as fast as you can, whilst doing so, press 'Enter'. This will make you abandon the match, but while clicking reconnect, you'll reconnect to the match you just 'abandoned'.
Step 5:
It'll say "[Name here] has abandoned the match and received a 30 minute cooldown." and then "[Name here] is joining CT/T"
Step 6:
Wait for the "WTF?!" or "HACKS!"
Step 7:
Toggle the rage! As you've abandoned the match, OW is practically powerless, and the only thing that can touch you is a VAC midgame, which is hugely unlikely.
Step 8:
Profit.
I've done this several times, and I remain unbanned, with no OW convictions or anything.