the house always wins

Short definition from Wiktionary

Proverb

1. 1
   In a casino, all gambling is designed so that the house (i.e. the casino owners) will always net a profit, regardless of the successes of individual patrons.
2. 2
   A given system is designed to net a profit for, or benefit, some (specified or implied) people.
3. 3
   In a given system or situation, over a long enough timescale, a particular (specified or implied) outcome is inevitable.