Examples? I right now work in one, but I wouldn't call my company big (<200 people).
From my (limited) experience google workspace doesn't really offer the level of control over employee computers that microsoft solutions do (like limiting what you can install or tuning settings). So it is a non-starter for any big company.
Of the recent places I've worked, both use it. Block was at ~14,000 employees, but I think they're currently at ~12,500. My current company uses it, and we're ~2,000.
From my (limited) experience google workspace doesn't really offer the level of control over employee computers that microsoft solutions do (like limiting what you can install or tuning settings). So it is a non-starter for any big company.