I said that when a company successfully crosses the chasm, it has established a leading positition in a mainstream market.
What that mainstream market is or the channels the company uses to win it is entirely dependent on its products and the landscape of products it either must displace (in an exiting market) or pre-empt (in a new market).
For example, Facebook crossed the chasm after it opened up beyond .edu and pushed MySpace into complete irrelevance.
Salesforce, when it closed a huge deal with Merrill Lynch (I think), made "the cloud" safe for everyone.
And as a counterpoint, Snap has not crossed the chasm, despite a $25b IPO.
And arguably, neither has Twitter, despite over $2bn in revenue and being public for years.