But Jackson's good mate and fellow season nine star Daniel Holmes rushed to his defence, replying to Clare: "Hey @clareverral put a plug in it."
Olivia shared her support for her partner, simply commenting: "🤤 💦".
But The Bachelor alum Kiki Morris also criticised Jackson's motives for joining OnlyFans, commenting: "This is repulsive".
Meanwhile, MAFS fans claimed Jackson's new social media move proves he "only went on the show for fame".
"This is just embarrassing at this point," one viewer wrote, while another commented: "You're very pompous now, not like on the show at all."
"They staged their cheating scandal, then upped their numbers on Instagram, then did a hard launch of their only fans. Was all calculated," said another.
Olivia joined OnlyFans last month while Jackson announced his debut on the adult content site last week with a shirtless dancing video.
"Big venture, a lot of you have already guessed it. That's it, I'm startin' an OnlyFans. Get involved. Click the link, let me know what you think and subscribe," he shared to his 126,000 Instagram followers.
Then on Saturday, Jackson shared a shirtless selfie where he was seen suggestively grabbing his crotch.
"Link in bio" the caption simply read. When Instagram users click on the link, it takes them to Jackson's OnlyFans account where he is offering subscriptions for $9.99 a month.
"If you think you know me…" his biography on the site reads.
WATCH: MAFS' Jackson Lonie caught kissing another woman
This article first appeared on our sister site, Now to Love.