Quoting from the article:

The strategy's three phases are:

• Embrace: Development of software substantially compatible with a competing product, or implementing a public standard.
• Extend: Addition and promotion of features not supported by the competing product or part of the standard, creating interoperability problems for customers who try to use the "simple" standard.
• Extinguish: When extensions become a de facto standard because of their dominant market share, they marginalize competitors that do not or cannot support the new extensions.

This has been done for open protocols by other companies before, many, MANY times. They're likely going to "joyfully embrace" the Fediverse, add some "improvements" that will be proprietary and only run on their software, then when people become addicted to "Meta Fediverse", close things down dramatically so that people only run their stuff. We must prevent that bullshit.