"People aren’t really fans of you, they’re fans of the show," he said. “That’s what I found."
He continued, "They might stick around on social media (after the show has ended) and give you a ‘like’, but when it comes to paying for tickets and buying albums, the numbers don’t translate."
While the show has been running in Australia for nine seasons, it has yet to produce a hugely popular performer.
The singer said that contestants should focus on the incredible experience, rather than hoping it would make them famous.
"When it came to the show, I didn’t really care," he said, adding, "I was just there to have a good time. I think some people go in expecting to win and that’s a problem."
Judah, who also appeared on The X Factor Australia, explained that he had very low expectations when he went on The Voice because he didn't have a very "enjoyable" time on the first show.
He revealed that he initially thought he'd make it past the audition phase and would then be kicked out for someone "who looks better on TV".
However, when Judah made it to the top four, he finally started to believe he might have a chance at winning.
The singer also added that the contestants shouldn't be expecting to make money from the show, saying singers on his seasons didn't get paid when songs they'd performed were released as singles.
He explained, "No, we didn’t get paid for recording those, but that’s fair because it’s not as if we paid for them to be recorded."
Judah won $100,000 after winning the show as well as a recording contract with Universal Music, however, after releasing two albums, a third has been put on hold due to the coronavirus pandemic.
He said, "I was going to [work on demos] this year … but with a tour falling through [due to coronavirus] it didn’t make sense to release music."