Hey Ele,
The definition of this is inevitably going to vary from business to business, primarily in terms of what we define around the actual "opted in" meaning.
System speaking, "marketable leads" excludes any lead records where:
- Marketing Suspended is true
- Unsubscribed is true
- Black listed is true
- Has no email address
- Has hard bounced
You'll notice the above includes no filters for details such as "opted in = true", nor any filter for duplicates - so yes, this would be included in the total.
If you're keen to better understand the difference between that number and the numbers in your recent send campaigns, you might need to delve into the campaign rules to see if any filters beyond these are being included - such as excluding duplicates (in most cases there should be additional filters, depending on your consent regulation environment, but also from a best practice perspective).
Personally, in addition to the above, I do look at duplicates (though more from an overarching awareness perspective than in specific send rules), plus custom opt out and opt in fields to define "marketable". I run an instance that looks across a few brands and countries, though, so have to factor in the definition of marketable from multiple viewpoints. For each send, there's then further database segmentation, but that's typically about defining targeting rather than marketability.
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