I don't know much about Bracket, but looking through their docs[1] it looks like they support streaming from Salesforce as an alternative to batch/scheduled jobs (which is what Fivetran does)
Yup! We offer two ways of interacting with Salesforce: polling and streaming. The benefits of streaming are faster syncs and optimized Salesforce API usage.
Right now, we're focusing on use cases that require changes to be synced within a minute. Fivetran and its ilk are generally more focused on large data batches at less frequent intervals (e.g., to unlock 1-minute syncs at Fivetran, you must be on the Enterprise plan, whereas we offer that out of the gate with the Starter plan).
[1] https://docs.usebracket.com/streaming