What are the open-platform alternatives? I was under the impression that the majority of printers used the CHITUBOX hardware platform internally, which was now locked to the CHITUBOX slicer. Has this changed? That would be wonderful news.

I don't think that Formlabs locks you into their wash and cure stations. Some of their printers lock you into their resin, but it looks like the Form Studio 1 discussed above and the Form 3, 3L, 4, and 4L let you use resin of your choice, although the Studio 1 does require you to buy a special $80 tray.