I should have been collecting the receipts on a rolling basis; chatter at the time for multiple of these was "deploying fast now for highest risk, doing the rest in a more controlled fashion after".
Thinking of:<li><p>npm ("encouraging FIDO2", anyway)</p></li><li><p>T-Mobile - <a href="https://www.t-mobile.com/news/network/additional-information-regarding-2021-cyberattack-investigation"; target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">t-mobile.com/news/network/addi</span><span class="invisible">tional-information-regarding-2021-cyberattack-investigation</span></a></p></li><li><p>Twitter - <a href="https://blog.x.com/engineering/en_us/topics/insights/2021/how-we-rolled-out-security-keys-at-twitter"; target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">blog.x.com/engineering/en_us/t</span><span class="invisible">opics/insights/2021/how-we-rolled-out-security-keys-at-twitter</span></a></p></li>
And probably:<li><p>Uber ("further strengthening our MFA", reading between the lines for 2022 breach and 2023 deployment) - <a href="https://www.uber.com/newsroom/security-update/"; target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">uber.com/newsroom/security-upd</span><span class="invisible">ate/</span></a></p></li><li><p>Discord (again, reading between the lines - 2023 breach, 2025 deployment)</p></li><li><p>eBay (public evidence is thinner here, but I got a couple of confidential reports)</p></li>
And a couple "we could see the writing on the wall" (they get points for that):<li><p>Google (2017) - <a href="https://krebsonsecurity.com/2018/07/google-security-keys-neutralized-employee-phishing/"; target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">krebsonsecurity.com/2018/07/go</span><span class="invisible">ogle-security-keys-neutralized-employee-phishing/</span></a></p></li><li><p>Cloudflare - <a href="https://blog.cloudflare.com/how-cloudflare-implemented-fido2-and-zero-trust/"; target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">blog.cloudflare.com/how-cloudf</span><span class="invisible">lare-implemented-fido2-and-zero-trust/</span></a></p></li>