According to Google trends, the people who left are an insignificantly small number, Reddit has still grown in search popularity over the last year. However, if you've browsed Reddit since the shutdown, you know that this isn't the whole story, engagement and quality are both down.
Disposable products are gonna have problems to keep them cheap. The solution to straws is non-dispossble straws, always was.
Also this is still a silly topic, straws won't save the planet.