In some ways? It is super helpful. In other ways, definitely not.
When it comes to dialogue, it helps to improve writers a great deal. Episode writing is very dialogue-heavy, so when people can’t write good dialogue, it shows up a lot more than it does in conventional prosaic stories. It is much easier to tell that an Episode story has bad dialogue that a Wattpad story, for example, because the dialogue is all you get and you’re watching people move their mouths and effectively “say” the words. So you get a lot more people pointing out if your dialogue is awkward or flat, which means much more scope for change that you can carry over into other mediums.
However, I read some stories from Episode writers on Wattpad not many of them make the jump from Episode to conventional stories very well. They rely too much on that episodic structure without realising that chapters and episodes are not the same thing and should be handled slightly differently. They haven’t developed the ability to describe events, characters, places and actions without exposition dumps and bland “she had blonde hair and blue eyes and was an average height” descriptions. They’ve relied so much on images that they don’t know what to do when they have them other than bombard their stories with them until they basically become picture books. Plus, flashbacks tend to be handled quite badly because you don’t need the same level of build-up to handle a flashback well in an Episode story. You can just literally do a different transition to show it’s a flashback with a little bit of build up so people understand the context. In a conventional story, you have to choose whether you want a character to narrate the whole flashback or start another chapter and do it all in italics. Then you have to choose how to explain to the reader that it’s a flashback without pulling the out of the story.
Episode is somewhere in between a book and a tv show and people need to understand that. The skills you learn from writing on Episode aren’t going to be completely transferrable and that’s ok. You just gotta learn a few things here and there and not rely on your Episode knowledge to help you through.