The spam folder (or the inbox, in what you consider outlook) isn't for messages known to be spam; it's for messages that the filter thinks might have a chance of not being spam.
Most spam is so low-effort that the spam rules route it directly to /dev/null. I want to say the numbers are like 90% of spam doesn't even make it past that point, but I'm mostly culling this from recollections of various threads where email admins talk about spam filtering.
Most spam is so low-effort that the spam rules route it directly to /dev/null. I want to say the numbers are like 90% of spam doesn't even make it past that point, but I'm mostly culling this from recollections of various threads where email admins talk about spam filtering.