Maybe I'm just being cynical here, but did leaving Meta facilitate the creation of Starburst enterprise based on open source Trino?
Starburst spun out from some contributors working on Teradata’s Presto distro in 2017.
The Presto creators left Facebook in late 2018 and worked on building the new community and fork for most of 2019. They joined Starburst around a year later.
I asked these same questions in my last company and it seems like nothing was correlated between starburst and the new fork. After talking with Martin T. (One of the creators of Presto) about it and a few other long time contributors and my concerns went away.
I ultimately started to contribute to Trino and over the years I’ve only seen a community dedicated to making a successful query engine. You can see that by the activity and growth of the project.
Feel free to remain a skeptic but the best way to know is joint the community and make your own assumptions. :)