[realityking]

That’s not true. Taking the US as the example, they have some very specific guidances what you can do on a B1 visa or when entering under a visa waiver.

Allowed: - Consult with business associates - Attend a scientific, educational, professional, or business convention or conference - Participating in short-term training - Settle an estate - Negotiate a contrast

Not allowed:

- Paid performances, or any professional performance before a paying audience - Arrival as a crewmember on a ship or aircraft - Work as foreign press, in radio, film, print journalism, or other information media

To take an extreme example, Microsoft can’t just have someone from Mexico come into the US for 3 months to work on a project in their Seattle office even though their salary may be paid by Microsoft Mexico.