Is email spam still a thing? I use both gmail & outlook addresses and I doubt I see a half dozen spam messages a year.
Now maybe these services just have really good spam filtering compared to having your own domain hosted by Godaddy or someone similar, but my experience is that spam is much less of a problem than it was, say 15 or 20 years ago.
Spam filtering is a double edged sword. Gmail does very aggressive spam filtering at a couple of levels. They straight out trash massive amounts of 'junk' email - no option to review it is just gone. The second level moves spam emails to a special folder. You get 30 days to review before it deleted. This gmail filtering is nice compared to the old spam filled days. But I still have review and pull real emails from the spam folder for my business and personal emails multiple times a week.
This whole problem of contractors, vendors, etc comes down to time management and priorities.
They tend to focus on their trade. This is what they are good at and makes them happy and money. Typically the business side is a necessary evil that takes time away for the core tasks. The growth of the web, email, cheap massed produced goods and instant response society has greatly increased the amount of tire kickers looking for that cheapest quote. After a history of wasting time on many quotes that go nowhere they have got selective on what they will respond to.
In some areas the process has changed. It is no longer the client selecting the contractor. It the contractor selecting what clients they want to work with. I have told potential clients no.