I suspect those X11 bitmap fonts are in arcane 1980s formats that would require a chain of conversions-- from bitmap to vector to get them to Postscript Type 1 or TTF, and then from TTF to WOFF.
Yes, I’ve seen a lot with old formats. I don’t think the bitmaps themselves are a problem, I already have a bunch (maybe they are faux bitmap though, not sure actually). And they don’t need to be woff though, that just adds some compression and prevents installation. The latter of course not being an issue for the fonts that are featured here.