As far as I know the XPRIZE community activities have been suspended by XPRIZE. However, there was no formal or official announcement via this forum. Probably this was part of the transformation due to new leadership at the top of the XPRIZE Foundation a couple of months ago.
A real pity from my personal point of view as this community (despite the quite diverse level of activity) has pulled in like-minded and passionate people around the globe who perhaps now feel sort of alienated.
Best regards from Dresden, Ralf