Gratis often signals non-commercial resources or services intended for public benefit. They provide language courses gratis to support the immigrant community.
Pro Tip 2/3
Not a Gift
'Gratis' implies no cost, but not necessarily a gift; it may lack personal intent or exclusivity. Maps are available gratis at the tourist information center.
Pro Tip 3/3
Implicit Expectation
Sometimes 'gratis' hints at an indirect expectation, like feedback or future business. After the gratis trial, many users decide to purchase the full product.