Use the “passwords” feature to check if one of yours is compromised. If it shows up, never ever reuse those credentials. They’ll be baked into thousands of botnets etc. and be forevermore part of automated break-in attempts until one randomly succeeds.
The aggregator wasn’t hacked, they essentially hacked the hackers and put together this list. This ain’t a data breach per se, it’s just putting together a bunch of past breaches and patching it up to HIBP.
Ah, gotcha. Thanks.