The RedReader app has been given accessibility status by the graciousness of reddit and will not have to shut down. The dev is not particularly happy about how fellow devs were treated though and still plans on adding lemmy in future. Read the announcement here
Nsfw subs will not be. Nsfw marked content in mixed subs should be
It was my understanding they were using an automod of sorts to also block porny NSFW content in mixed subs, but would in theory allow non sexual NSFW content?