What about using a fine screener/mesh on drained water in the wash machine (ie similar specs to that wash bag) to filter out all outgoing water? This would add a mandatory step to clean it up regularly (and ideally not with water in the sink so all of it just ends up in waterways anyway).
Or some replaceable filter in style of vacuum cleaners, that could last a year or two and wash machine would indicate the replacement time. This doesn't seem unsolvable with proper regulation.
Such a system exists, it is sold in Canada, best I recall last time the subject came up on HN. Looked at a few options, then lost interest along with any memory of the details. If you’re seriously interested, specifics should be a minor query challenge.
Or some replaceable filter in style of vacuum cleaners, that could last a year or two and wash machine would indicate the replacement time. This doesn't seem unsolvable with proper regulation.