Full disclosure: I am a PM at Fivetran who is very excited about this.

We are fully committed to open source dbt and don't want to build a 'walled garden'. Interoperability is one of the key value propositions of both Fivetran and dbt. While I'm biased, I think the main implications for users is that their favorite tooling will be with one vendor who cares about what makes them great.

You can read a bit more here: https://www.fivetran.com/blog/the-era-of-open-data-infrastru...