I think public interest was more sparked by his obviously fantastical claims of other achievements (not the plagiarism) that were unquestionably accepted by various media and his book publisher. Too many were obviously disprovable, the universities where he claimed to be a visiting professor, the installing of water points in South America and West Africa, the huge sums of money raised for charities, his running The last 9 marathons in a 30 marathons in 30 days challenge with a fractured leg, and many more. How any interviewer could hear all this and much more and not think "really? sounds a bit over the top" I do not know. I blame all those outlets that swallowed his stories without question, who fed his ego. When it became obvious that it was all going to crumble Jason Arday has likely committed suicide, which is a tragedy for him and his family.
It's worth remembering that an average of 20 people commit suicide every day in the UK, each and every one a tragedy. Much more needs to be done about suicide prevention.