Many of the companies that appear to be "harvesting" their entrenched customers have not switched away from a FOSS license.• Facebook
• Google
Examples:
• Apple
• Amazon
• Microsoft
• Netflix
• Red Hat
Examples:
• Apple
• Amazon
• Microsoft
• Netflix
• Red Hat
Strategy #1 is self-interested and doesn't require any real zealotry and survives the harvesting stage just fine.
Open sourcing your core product with a permissive license is generally going to be at odds with business goals at some point, and if you're in business, often the thing to give is the license.
Only Red Hat on this list comes even close to open sourcing a significant percentage of its stuff.
If you want Free Software, then feel free to use something more potent than merely an "open source" license the next time you release something.