This is how i see it, labcoin chose to prove they are hashing one day before BTCTO announces its closing down, i would find it very unlikely that the stock issuers were  not told before the announcement that BTCTO will be closing down in order to give them time for preperation etc, therefore Labcoin could've probably gotten away without ever proving they are hashing by delaying, however they didn't why ? becouse they are not a scam? who said scam? once you realise they are not a scam, you will realise that the scam is only inside your head