I have never used X/Twitter so I don't know how it works, but don't you have to seek out an account in order to read it? X won't just throw a spoiler at you unsolicited, right?
No there is a feed, if you follow a topic such as a show you probably will get exposed to it.
I think they algorithmically show you content designed to provoke engagement
TFA mentions what the actual issue is (it's not simply spoiling people)
https://github.com/twitter/the-algorithm
If it catches engagement, the main firehose feed will show it. They've begun using Grok and AI processes, which is hit and miss, but definitely improving.
Having Japanese, French, other countries' tweets automatically translated back and forth has been fun, too. It'll be interesting to see where it gets to in the next few years.