[chakspak]

BSL is not an Open Source license, as it does not meet the requirements of the Open Source Definition. https://opensource.org/osd

[ffsm8]

For the lazy

Unlike open source licenses, the BSL prohibits the licensed code from being used in production — without explicit approval from the licensor.

Especially the (1) of the originally linked licence will make it pretty much unusable beyond the smallest deployments (limited to <1k invoices)