Is Linux FOSS or open source?

“The Linux offered under the GPL carries a few surprises under
the hood.

“Specifically it contains some drivers and adapters whose use is
restricted, through language in the code, to regular use with
specific hardware.

“To Brazilian FOSS activist Alex Oliva (right) this violates
FOSS principles to such an extent that it renders Linux open

“Actually he has a more loaded term for it — “free

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