According to curl the certificate has expired for at least https://api.amplitude.com/. There was an issue over the weekend with an expired root certificate from Comodo/Sectigo CA for https://openexchangerates.org as well. Perhaps these sites are using the same certificate chain. Have you checked their support site?
kip@Kips-iMac-Pro cldr_dates_times % curl "https://api.amplitude.com/"
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.haxx.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
