Maybe not to the same extent. In a company I worked with recently they used it a lot but didn't store data in it, meaning there was very little lock-in: mostly inertia/convenience.

If BS slightly raise the price and ruthlessly cut costs (think - leave just a skeleton crew to keep it running), the calculation may make sense even if there's slow churn in the users and no special lock in.

(disclaimer: pure outsider speculation on my part)