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If I were actually using Xilinx FPGAs I'd be more pissed off. Luckily the projects that interest me currently are based around Intel, Lattice and Gowin devices.
That's just like when macOS users got mad when they learned they were targeted by marketing schemes to sell them more expensive stuff [1].
[1]: https://www.npr.org/2012/06/26/155792590/orbitz-targets-mac-...
Even Apple doesn't charge you for the software needed to actually be able to use their devices (well since around Snow Leopard or so, at least).
But I suppose the idea of not being as greedy as possible really "pisses off" AMD's executives (and presumably some of the people shilling for them here).
And presumably you didn't read the article since AMD will continue to support this on Linux anyway.
It just seems like a weird decision on AMD's part.