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[Symmetrick]

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[TheBeardedBaby]

You just report it with the following >

"Dead project! OP is inactive for <insert time> time and the website is inaccessible. Please lock the topic to avoid further spam"

This should be enough to get the topic locked and slowly die in oblivion.
No need for further actions I think.

[LTU_btc]

Well, I don't think it's problem at all. If website doesn't works anymore, their topic quickly becomes inactive and it soon goes to 5th or 10th page in that board. I don't think there is big need to lock these inactive topic because usually nobody posts in it. Only sometimes we can see some spammers who bump inactive topics or it's done by bots.
In perfect situation, authors of topic should lock it when they don't provide services anymore. But if they don't provide service anymore, usually it means that something went wrong with their business and locking ANN topic isn't their main concern. Other scenario that they done exit scam, well, in such case I also doubt that they are going back to lock topic .

[mk4]

What TheBeardedBaby said.

You don't even really need to be hunting for them though. If their platform is dead, the threads are simply going to slowly but surely die out by moving farther and farther down the pages of the gambling section into oblivion. But if you want to look for the dead threads to be able to report them for locking, then kudos to you.