Startups accuse Microsoft of ‘billing trap’ in Azure AI Foundry after unexpected charges

Startup founders in the Microsoft for Startups program are reporting unexpected charges after experimenting with third-party AI models like Anthropic Claude through Azure AI Foundry. The platform's unified interface displays both Microsoft-native and third-party marketplace models without visual distinction, warnings, or confirmation steps before billing begins. At least 20 founders have signed a Change.org petition addressed to Satya Nadella, describing the situation as a 'billing trap.' Individual charges range from ~$1,000 to $1,600. Affected users report being bounced between Microsoft and Anthropic for refunds, with neither taking full responsibility. Microsoft's own support moderators were initially uncertain whether startup credits applied to third-party models. Petitioners are calling for clearer UI labeling, explicit billing warnings, and confirmation prompts before deploying paid third-party models.