Some websites punish you for shorter chapters. Other websites encourage it.
In my experience:
WN: 1,5k+ is required. Otherwise, your updates won't really show up.
RR: 1,5k+ or people will complain... ESPECIALLY if you do shoutouts. Slightly shorter chapters are acceptable, though, but really keep it above 1k.
SH: The more chapters you post, the better. Views affect the algorithm, and every chapter makes your story pop up on the front page. Still, even here, there is a limit. If you keep posting 500-600-word chapters, people won't bother. I'd suggest at least posting 1k chapters, but if you want to go for maximum visibility, maybe 500-word to 1k-word chapters are still okay.
Just think about how you feel as a reader when you like and follow a story. What would your reaction be to waiting for a day or two and then getting a 500-word chapter? If you are fine with it, then go ahead. This is all subjective, and everyone will tell you something different.
Personally, I'm always aiming for 1.5k to 2k-word chapters. In my opinion, that's the sweet spot.