Are you just connecting to the local SQLite database?
Of course they will be able to do that. It's 100% possible.
How could it be more suited to bridging than Matrix which had bridging in mind since it's existence?
Most WhatsApp clients rely on scraping the websocket channel used by the official web client, but that requires your phone to be online to send and receive new messages.
I'm assuming iMessage scraping happens on macOS, requiring your mac to be online as well.
BUT: Stating "Privacy first." as a goal and then requiring to sign up with google is … inconsistent at least (I get that it's easier though).
Planned support for also Email (first priority), SMS, Signal, matrix, etc
Where are they all coming from suddenly? curious