Building a business takes years of effort. Losing the right to use its name takes one application, filed by someone else, in an afternoon.
Mexico grants rights to the first to file
Using a name in commerce, however long and however publicly, does not create a trademark right in Mexico. The register does. If a third party files your name first and obtains a registration, that party can demand you stop using it, and you are the one who has to prove bad faith to get it cancelled.
What you are exposed to without a registration
You cannot stop a competitor using a confusingly similar name. You cannot demand a takedown from a marketplace, because their process requires a registration number. You cannot license the brand, because you have nothing to grant. You cannot include it in a valuation, and any serious investor will treat it as a red flag in due diligence. And you may be forced to rebrand after years of building recognition.
What registration gives you
Exclusive use in the classes you registered, for ten years, renewable indefinitely, plus the right to enforce against infringers and the ability to license or sell.
Where to start
With a search. We run the availability search and give you a written opinion at no cost, so you know whether your name is registrable before you spend anything.