Netflix seems to be hedging their bets by partnering with T-Mobile, the company aiming to bring 5G wireless to the US. As for Alphabet, I'm submitting this comment via my 1Gbps synchronous Google Fiber internet connection. Google seems to have stalled rollout of Fiber, however.
I haven't heard much recently from their more standard wireless attempts (other than Loom being used in Puerto Rico) but they did invest (jointly with Fidelity) $1 billion into SpaceX. The assumption is the SpaceX investments are specifically to support the SpaceX Starlink constellation which if successful could bring wireless internet to pretty much all of the planet.