From my european perspective, where sending money between bank accounts is free and easy using their first party apps, the last thing I'd want involved is paypal who have a reputation for stealing people's money and generally being difficult to deal with.
Paypal is known for support issues, but Google?! That's a whole other level of support pain ..
I can just imagine my account blocked, thousands there, and... what? A wall of canned support answers, no recourse, misery.
This is Google.
Edit: come think of it, I know counterexamples :(
They own the internet's biggest advertising platforms, but I don't know 1/2 if their products.
I just said to myself I need to look into Google pay. Then I realized I use it on their domain registration app.
And by advertising---not the typical hip flashy "Street" horrid ads they are notorious for, but just a developer taking about a useful product.