Well, lets see duckduckgo search the largest tech companies back to office dates...
> Google tells employees to return to offices in April
> Apple sets April 11 date for return to in-person work for corporate ...
> Microsoft Returning to the Office on Feb. 28 as Covid Cases Decline
I doubt they decided independently on a back to office date in the same ~1 month timeframe, remember these same folks had an anti poaching agreement and set limits on engineer salaries. They colluded to control engineers and they'll collude to force them back to the office if they feel it's best* for their industry.
Unless employees have a similar level of coordination and control, for example a cross industry union, they will continue to be pushed around. If people don't make a big deal of these moves the company can withstand the few hold outs quitting.
*I doubt best for "the industry" is best for the consumer. Best for them is probably most controllable pliable workforce.