Is the STM public?

In the realm of cryptocurrency and finance, transparency and accessibility are often paramount. Given the significance of these factors, I must inquire: Is the STM platform publicly available? This question arises out of a desire to understand the reach and accessibility of this potentially influential tool or system. Is it designed for a select group of individuals or is it intended for broader use? Clarifying the nature of STM's accessibility is crucial in evaluating its potential impact and significance within the cryptocurrency and finance landscapes.