While I agree with this, generally, one shouldn’t fully trust company-based entities (system76, Tuxedo, etc) that ship Linux-based OS to actually contribute to the FOSS community. It’s good for casual users or beginners to FOSS world that they can get a preinstalled FOSS OSes like Linux-based OS with their machine. This contributes the spread of FOSS OSes 
However, in the end, these are companies, and probably route their majority of income to their personal pocket, not to the various FOSS communities out there. They may use the Linux brand for their niche market, who knows eh.
And one should really be suspicious if the Linux-based OS vendors (like Tuxedo and not something like Lenovo) out there only provide Linux-based OSes that come from a company-based distributors (Canonical, etc), but exclude community-based OSes like Debian, OpenSUSE, etc. Pretty much it’s a web of companies for profit without community contribution as their primary motive, … or maybe me just being too distrustful with companies
.
Not only OEM vendors, the same applies to company-based distributors. Remember the fishy fishy
finance of the company that distributes a Linux-based OS with the name similar to Mt. Kilimanjaro,
while at the same time manage to get org
domain (eh WTF) ?
Disclaimer: I’m just too distrustful with companies eh …
IMHO, the best way to support the FOSS ecosystem, including Linux, is to directly contribute to the FOSS communities itself. Like the communities that develop and maintain:
- Various DEs, like GNOME, KDE Plasma, XFCE, etc.
- Various FOSS software, like the GNU project, VLC, GIMP, etc.
People contribute to these actual communities, will improve the overall FOSS ecosystem, whether by its quality (great features compared to the proprietary counterpart) or by its breadth (covers a substitute for proprietary software in which the FOSS counterpart doesn’t exist yet). These communities directly drive the future of FOSS OSes like Linux-based OSes out there.
Not demonizing Linux-based OS OEM company-based vendors out there. Just make sure to know that supporting these companies doesn’t necessarily support FOSS in the big picture.