Just to be clear, J wasn't lead down a stray path, she's an extremely astute business person and was mates with L prior to the pod. Prior to starting the pod they'd fallen out and didn't speak for a number of years. J knew that L being explosive is entertaining and was happy to build a career around packaging that for the consumption of others. Everyone gives J a considerable amount of sympathy here for professionally handling the situation, but consider that the product they were selling was L's life and what that means.
L's clearly a vulnerable person with a massive audience. Her life and all its ups and downs are broadcast in a very public way while J's are not. J could quietly disappear and take up another career, L's career is sharing her entire life online. She is fully locked in to doing this and will never have a normal job, even if she wanted to. Sure she didn't have the same financial difficulties other single mothers have, but she's had an extremely emotionally difficult life. She's grown up in a super strict born again cult. She was basically forced into an arranged marriage at 19 to a shithead who didn't want anything to do with his son. She was robbed of a normal adolescence and adulthood, and her own agency. Despite it all she's come out being able to make light of this and tell her story in a funny and compelling way. Sure J handled all the mechanics of running the podcast, but Itgalz is intrinsically about L's life. It's her ups and downs that's the heart of the show. So it makes sense for L to buy J out and continue it on.