In much of Europe, contacting staff outside working hours is regulated. France gave workers at firms with more than 50 employees a right to ignore after-hours email in 2017. Italy passed a similar law that year, Spain and Belgium followed in 2018, and Ireland, Greece and Portugal acted in 2021, with Belgium adding more rules in 2022 and Slovakia in 2024. Portugal goes furthest, limiting contact outside working hours to emergencies, with fines for employers who break the rules.
The European Parliament asked for an EU-wide right to disconnect in 2021, but that law is still being drafted, so protections vary country by country. WhatsApp has around 500 million monthly users in Europe, where it carries much more workplace chat than it typically does in the US.
For readers in the US, UK and Canada, the practical upshot is simpler. Scheduling lets you send a reminder to a friend in another time zone at a sensible hour, line up a birthday message the night before, or queue a customer follow-up for business hours. Small businesses that run on WhatsApp could find it especially useful.