They're less well supported nowadays than they were. For instance, they used to be well supported by Parabola (one of the FSF-endorsed distros), but since then

They're less well supported nowadays than they were. For instance, they used to be well supported by Parabola (one of the FSF-endorsed distros), but since then Parabola's dropped support for MIPS, because every Parabola developer working on MIPS either had their Yeelong crap out or get stolen; and they're hard to replace. Also, MIPS has never been supported by Trisquel (another FSF-endorsed distro), and I suspect that since the lead Trisquel developer has since been hired as the senior sysadmin at the FSF, he gets some value out of giving RMS a laptop running Trisquel.