Multiple pools connecting to identical relays

Hi,

I’ve noticed 1PCT has 22 pools all connecting to the same two relays: r1.1percentpool.eu and r2.1percentpool.eu
Is this all achieved by using an identical cold key, but different owner/rewards?

I would have thought a unique cold key per pool registration would be required thus requiring a unique set of relays per pool? It’s quite an ingenious way of sybil attack behavior, rather than delegate 1m ADA to a single pool when you can split it 20x as long as you have enough delegators and less 1% fees.

Cheers,
Ryan