The US is not the only country that has non-profit status for corporations, and PIR is not obligated to be an American organization.
The change to for-profit mans that, regardless of whatever platitudes, B-corp statuses, advisory groups and promises Ethos can make, at day's end its goal is maximizing profit and/or company value. There's nothing stopping Ethos from breaking all its progressive promises if it doesn't meet its targets, or building up the value of PIR then flipping it to an owner without such community motivations.
Probably. But since there was no openness to the search for a buyer, no publicly visible competitive process, we'll never know what options could have been available.