I know someone who stole images from somebody else’s site to use on his own.
It turns out they were stock images from one of the many agencies owned by Getty. The original site had paid for them correctly, but he (having stolen them) had not.
He got one of the now infamous “Getty letters” (google it) demanding £1,200 in damages.
Basically, you have no defense in court, and if you lose (which, having no defense, you will) you have to pay their requested damages plus their legal costs which are about £10k as they use barristers.
He paid.
He didn’t steal images again.