It is better to have an extension rather than to call off the ICO itself, you may not get paid at the same time your efforts have gone to waste, most of the ICO's are extending their token sale so that is a normal occurrence, it is so early to call it a scam without the proofs rather than that, the reason might be the bears for crypto at the same time the confidence of the investors to ICO's, admit it there are so many projects right now, hard to depict scam not unless you've gone some research to dig the eligibility of the campaign.