Why don't some users see recaptcha2 from google?

Question

reCAPTCHA

I am a developer of a large service with high traffic.
Some time ago, we connected recaptcha2 from google to the input and some other actions.
Since then, some users simply do not load recaptcha. Just an empty space where it should be.

Answer 1

plug-ins in browsers, for example
anyway, this is not under your control, so think about how to decide without relying on Google