It's easy to click the "ignore" button.
That's easy, but you shouldn't do it often enough when you come across spam. Just like finding the ignore button, the report to moderator button is also easy to find. I wouldn't ignore it as it's not a good choice when you care about forum rules about posting spam. Report the post if you believe it is spam.
Well, I know that there's spam ongoing but what's the point if the mods deleted the spam but they can do it once again? And, we aren't talking here about 2-5 users who continue these spams, there are a lot of them. My point here isn't about deletion as it may a hassle for myself alone to report it, I do care about forum rules but if you're asking mods to purge them all at once since they do these countless spamming I think that's better rather than just delete them one by one.
I believe your point but my opinion is to just ignore them since you can't filter them all as spamming when there are rare posts who are still on topic. I'm not defending them but it's just my opinion to ignore them all.