Referencing the companies in the original tweet, each one has a landing page (internal or on Github) for how they contribute to OSS. Making open standards which are cross-compatible between programs doesn't happen overnight, where often community-driven users are a force under which further awareness and adoption are spread.
[0] https://opensource.microsoft.com/
[1] https://aws.github.io/ and https://aws.amazon.com/mp/oss/