The NSFW filter is going to suck. Not because of porn, I don't care about being able to access that on Reddit, but because of the NSFW tag culture. For example, in some miniature painting hobby subs, people will mark anything with blood painted on as NSFW. Hell, over the past 3 years I've seen more and more text posts get a NSFW tag for swearing.
As much as I want to support Relay after using it for so many years, it would suck not knowing what pseudo-NSFW content is being hidden from me.
The 'spoiler' filter tag is a nice alternative to NSFW...when it works.
Unfortunately, Reddit doesn't always apply the thumbnail blur, which led to The Mandalorian being spoiled for me. :-(