@Seba Bottinelli Nope, you either have to make the board public (so everyone can see it, including being indexed in Google) or add people as members of the board, which means they'll need a Trello account. You can modify permissions so that not everyone can comment, but all members can interact with cards unless they're observers (the Observer feature is only available with business class).
If you have Trello enterprise, you can easily add everyone in the organisation to a team, which means they would have a Trello account (you can also use Single Sign on with Enterprise) and then make the board team viewable.
You need to have at least 20 users to get the enterprise plan.
If you had to thrive a new habit during a lockdown, what would it be? Trello
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