It's a bit more complicated than that - dplyr and magrittr invented pipes independently at about the same time. I preferred magrittr's implementation, so switched to that. dplyr continues to import and re-export %>% so that you don't need to explicitly load magrittr.
I wasn't aware of this parallel origin for the pipe. Just out of curiosity what did magrittr's implementation have over dplyr's? Thanks for incorporating forward piping in dplyr, it improves functional order/readability by miles!
Actually, it was magrittr[0]. dplyr popularised their use.
[0] https://cran.r-project.org/web/packages/magrittr/index.html