Over the years, there have been multiple examples of open-source software
that, suddenly, was no longer open source; on August 10, some further
examples were added to the pile. That happened when HashiCorp announced
that it would be switching the license on its products from the Mozilla Public
License 2.0 (MPL) to the Business Source License 1.1
(BSL or BUSL). At least one of the products affected by the change, the Terraform infrastructure-automation
tool, has attracted an effort to continue it as an open-source tool in the
form of a fork that would be maintained by the nascent OpenTF Foundation. That seems like a
sensible reaction to the move, but it also helps serve up yet another
reminder that code which is controlled by a single entity is normally
always at risk of such
adverse changes.

Source: LWN.net – [$] HashiCorp, Terraform, and OpenTF