Suppose for example that Google enacted this policy:
(1) They reimburse each employee up to $30k to upgrade their home office, including soundproofing. After Google trained local builders on effective soundproofing strategies and designs.
(2) Google provides (with installation) a Google Jamboard to facilitate virtual whiteboard sessions.
(3) Google updates their team rules and meeting rules s.t. if anyone in a team or meeting is remote, then the entire team or meeting is remote.
(4) Google invests in networking infrastructure (as needed) to ensure decent network connectivity from the employee's home office to Google's internal networks.
I imagine that all FAANG companies could afford this. The open question, to me at least, is whether or not that magnitude of investment would make WFH a net win for those companies. But if they see WFH as a short term measure, I assume the answer is no.