Altering the condition of the ball is way less of a big deal than is made of it in the cricketing world in my opinion. It's based on a totally subjective judgement that making the ball shinier = good, making the ball rougher = bad and I think it's ridiculous how much hand wringing is attached to it.
I accept I'm in a minority. Full disclosure, I am (or was) a fast bowler, and have a bit of a bee in my bonnet about the constant trend over the last couple of decades towards favouring the batsmen more and more (I switched on a T20 last night and the boundaries were ******* ludicrous!). Frankly if I had it my way, ball tampering would be legal ...
This
EVERY international team, without exception, has indulged in ball tampering; sand in the pocket, bottle cap, saliva and sweet lolly, the tube of chapstick, the zinc cream on the face, the rasp-faced button on the back pocket, using the trouser zip, lifting the seam with a thumbnail....
Lets name a few names of ball tamperers shall we
1990 - Chris Pringle, New Zealand (Warning)
1994 - Michael Atherton, England (£2,000 fine)
2000 - Waqar Younis, Pakistan (suspended for 1 match, fined 50% of match fee)
2004 - Rahul Dravid, India (fined 50% of match fee)
2005 - Marcus Trescothic, England (never charged but admitted to it three years later)
2006 - Inzamam Ul Haq, Pakistan (match terminated and result awarded to England by default)
2010 - Shahid Afridi, Pakistan (suspended for one match)
2013 - Faf Du Plessis, South Africa (fined 50% of match fee)
2014 - Vernon Philander, South Africa (fined 75% of match fee)
2016 - Faf Du Plessis, South Africa (again) (fined 100% of match fee)
2018 - Steve Smith, Australia (suspended immediately and sent home, banned from all cricket for 12 months)
2018 - Mark Warner, Australia (suspended immediately and sent home, banned from all cricket for 12 months)
2018 - Cameron Bancroft, Australia (suspended immediately and sent home, banned from all cricket for 9 months)
2018 - Dinesh Chandimal , Sri lanka (suspended for one match)
Smith's and Warner's crimes were allowing Bancroft to be clumsy enough in the way he went about it to get caught.
It is worth noting that these three were dealt with far more harshly, by a couple of orders of magnitude, than anyone before since!