Non-paying users aren’t customers, though, so they must view all this outrage seems irrelevant. Which suggests that they view free-tier Linux users as significantly less likely to ever pay for its use. That matches my understanding of the (non-Steam) Linux as a miserly and demanding target market, so I don’t really fault them for the choice — especially given how brutally expensive it is to support the IDIC of Miscellaneous Linuxes. Kind of surprised they haven’t just withdrawn free support for anything but Steam Linux, in order to lower their costs (and to produce a ‘free’ build that anyone can run privately but doesn’t interop at all with enterprise). Maybe they want it to be a ‘shareware trial’ for enterprise? Or perhaps they just haven’t thought of it yet.
Vivado is an IDE for programming AMD FPGAs. One cannot use it without buying AMD hardware.
The "free" version of Vivado is used to develop for Xilinx/AMD's lower tier FPGAs. While offering what I assume are lower profit margins, these lower tier FPGAs make up a large portion of Xilinx/AMD's chip volume.
Xilinx/AMD charging for any of their tools is also a recent thing. 20 years ago, you could download these tools freely without even having to register on their website.