Pros
If you're just starting out, you'll learn a lot about how the business works. Depending on the editor you get for each piece, your writing will get better. Some are very good at their job. A true content mill, so there's always many topic to choose from.
Cons
Lots of passive-aggressive "help" and "reprimands". Like, constant. The pay is actually embarrassing. Again, it all depends on the editor that you get. Lots of them just don't care or are so narcissistic that they find a way to insert themselves into your piece somehow. You never actually speak to anyone, as it's all remote. Makes it hard to develop a bond with anyone when you get Slack messages for years from total strangers. Again, it's just a content mill. Use it as a way to gain some content for your portfolio and to pick up a few pointers on writing but don't expect to enjoy it. They publish about 40 pieces a day, one after the other, in a bid to gain some kind of SEO traction.