That is the excuse I heard back when spam was novel. What's the harm? The recipient might want it. That sounded almost reasonable 25 years ago.
Now estimates vary widely, saying that 50% to 85% of mail is spam. Extensive spam filtering is a must. Actually relevant mail regularly gets lost because those filters aren't perfect. And deliverability is, at least for me, a constant worry.
A person with no pecuniary motive chatting me up where the behavior costs us the same amount of time? That's fine. Somebody paid to chat people up in high volume because they hope to get more money out of me? Not fine. Somebody using automated tools to do that such that recipients spend far more time than the sender? Not fucking fine at all.
For example, consider the gaping assholes, perhaps as few as 3 people, who were behind the literal billions of robocalls for extended car warranties. Did some people like that, grateful to have their worries about their car solved for them? Maybe, but I don't care. I would like to be left alone until I reach out, thanks. And if you don't like that ethos, please go talk to the people behind the thousands of robocalls and literal millions of spam emails I've had to deal with over the years. Because you're wasting your day telling me I should be nicer to people who value their money more than my time.