Many businesses can benefit from email marketing and running a regular email newsletter. The ideal is you create 1-2 blogs a fortnight. Post to email, share on facebook, twitter and Instagram. Every business from a Cafe to the tattoo studio needs a mailing list. They are an asset for your business that you control, unlike 10k twitter followers.
we use substack as it pays per sign up and can bring in some extra income for the business. Their are many great things about email and a mailing list should be a part of every website. we recommend a regular newsletter as a major part of your digital plans.
Check out Substack for mailing list hosting. They pay you and you can have a free list of 2,000+ unlike Mailchimp.
If you sell things online then a mailing list is needed a 2 weekly news and random sales and events is fine.