Could you lay off 50% of Google today and still have a functional, competitive product tomorrow? Yes.
Would you still have a functional, competitive product in 2 years? No.
Engineers are building and maintaining the product, SREs are keeping the jobs, servers and infrastructure humming, sales is bringing in new clients and keep existing clients happy, marketing is... OK maybe Google does need a marketing overhaul...
[0]: https://youtu.be/4RMhf0YELrA