Nothing in life is free. MetaMask announced it had made updates to its products' use license.
The company stated in a press release published on its blog that the new updates will not have any impact on all end-users, most application developers and non-profits and will be free of charge for those groups.
The company clarified that it would continue publishing and iterating upon the wallet provider API in the public sphere, ensuring a widely cross-compatible ecosystem of applications. It added it would remain committed to publishing all code in a public repository.
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https://cointelegraph.com/news/metamask-updates-user-license-some-users-need-to-pay-fee