Comment by fheisler
This is exactly our thinking with authentik (open source IdP), and it's played out in practice so far. Enterprise sales conversations are so much easier when they start with "we all use you in our homelabs already." We're much more focused on giving those individual users a positive early experience (in hopes that some small percentage will really pay off down the road) than in extracting a few dollars from each of them.
I had this exact conversation with a Cloudflare rep a year or two ago, after I told her how I user their free DNS service. She said, "that free service was the best thing we ever did". And we wound up buying their bot management and DDOS services.