There were 2.79 billion internet users in 2014 https://ourworldindata.org/grapher/number-of-internet-users?... so the number couldn't have grown 10x because there are no 27.9 billion humans yet. The latest data is from 2020, so maybe it's at least 2x what it was in 2014.

Most of those new internet users are in Asia and do not use English as their primary language. If you look at editor counts of other Wikipedia editions; Hindi https://stats.wikimedia.org/#/hi.wikipedia.org/contributing/... , Indonesian https://stats.wikimedia.org/#/id.wikipedia.org/contributing/... , Thai https://stats.wikimedia.org/#/th.wikipedia.org/contributing/... , Persian https://stats.wikimedia.org/#/fa.wikipedia.org/contributing/... kept growing after the English Wikipedia saturated.