A daily email with the day's matches for your alert ranked by popularity. Daily digests work well for broad topics that have a large number of matches (e.g. wallet, identity and web3).
Some things can't wait for the daily digest. Like when someone has a problem you have a solution for. Or when an unhappy customer needs help. For narrow topics like product names and company names, an 'as-it-happens' email alert is best.
Email can get noisy. And it's not always easy to comment on, share or save alerts delivered to email. In situations like this, you can have your alerts delivered to Slack, Airtable, a CRM, or thousands of other well known services instead.