Evidence about Twitter/X’s user metrics since December 2021 indicates that its primary monetizable/daily active user base has not reached ~300 million.

Key points:

1. Starting point near the prediction date
   In Q4 2021, Twitter reported about 214.7 million global monetizable daily active users (mDAU), up from ~209 million in Q3 2021. (benzinga.com)

2. Highest official mDAU before going private
   The last official public filings before Elon Musk took Twitter private show mDAU peaking at 237.8 million in Q2 2022, up from 229 million in Q1 2022. Multiple independent summaries of Twitter’s earnings and Statista’s dataset agree on this figure and treat it as the all‑time high for mDAU. (androidcentral.com)

3. Post‑acquisition daily active user data
   After privatization, Twitter (now X) stopped regular official disclosure, but available data points and reconstructions show levels well below 300 million daily actives:

   • A widely cited November 2022 snapshot puts X at 259.4 million daily active users, presented as a high point. (jeffbullas.com)
   • Multiple 2024–2025 overviews of X statistics converge on about 245 million daily active users, with the company itself described as claiming “200 to 250 million” DAUs. (owlead.com)
   • One 2025 roundup notes that current stats show about 245 million DAUs, with outside estimates ranging “between 240–300 million”, but still centers its own estimate around 245 million, not 300 million. (igbestcaptions.com)

4. Monetizable users remain anchored to the old 237.8M figure
   Recent 2025 summaries that mention “237.8 million monetizable daily active users” are clearly reusing the last public pre‑acquisition mDAU number, not reporting a new, higher figure; no credible source shows monetizable daily actives rising to ~300 million. (mobilemarketingreads.com)

5. No evidence of a 300M‑scale primary user metric
   While monthly active users (MAU) are now often estimated around 560–600 million, the prediction as normalized is about monetizable or daily active users, not total monthly actives. All available official numbers and serious third‑party estimates for mDAU/DAU top out in the mid‑200 millions, not around 300 million. (affmaven.com)

Given that nearly four years have passed since December 2021 and the best available data never show Twitter/X’s monetizable or daily active user base at or near 300 million (only around 230–260 million at peak), the most reasonable assessment is that Jason’s prediction did not come true.

Because X is private, it’s theoretically possible that an internal metric briefly touched 300 million without disclosure, but in practice such a milestone would likely have been highlighted by Musk or in industry reporting. The consistent clustering of independent estimates well below 300 million makes the prediction best classified as wrong.