I read them cause I honestly can't freakin resist the urge to do so. When it's about that I'm actually very impatient. Most of the time I don't regret it, but sometimes it's awful, especially when there is some sudden turn in events, a reveal, a cool character introduction (for example Kaido entering the scene in Wano) or something. In those cases the surprise is gone and the hype is much less I'd say.
For example I stopped reading spoilers for a while right at the end of Dressrosa and I've got myself Kaido's intro unspoiled.. That was crazy.
Definitely one of those times were reading spoilers wouldn't have been a good idea to do.
But if not for those let's say "that shit was unexpected" chapters, reading the spoilers is actually pretty cool. I especially like to do so when we got some action chapters/powerscaling shit, often times it actually even hypes me up more for the actual chapter and the visuals. Then it feels like I've got myself "two One piece days" that week.
Tho in general I only really go at it, when images and/or a proper amount of info was already leaked.
If there are only One liners and "there will be a cover page next week" messages, I do not even bother. (that's why I don't like those overly early spoilers we got the last two times)
Tho next week w/o spoilers now. Let's see how it will be