in the us, payroll is often handled electronically and employees can update the info on their own. so theres no need to actually ask permission unless the employer or payroll company place restrictions
Discussion
In most big companies in the UK, it works like this too. But it only accepts a UK sort code + bamk account number (i.e., proper banks or bank-like fintechs; not crypto exchange accounts, as far as I know). I’ve also never worked for an employer whose payroll system lets me split my salary, though it might be possible by calling HR / Payroll team.
For people in investment banking, you’re often required to pre-clear crypto transactions before buying or selling; just as you would with stocks, ETFs, bonds, etc.