Let me answer to this properly:

1. We have interest in Open source in general, not only Fediverse even if we also support Mastodon, Friendica, PeerTube, Gitea and also soon KBIN and Pixelfed
2. We contribute in code to some projects, and we also give back part of our revenues to open source authors partnering with us
3. There is NO lock-in, at any time customers can download a full backup and run their stack anywhere else
4. We (human support team) have no access to customers servers unless customers give us the permission and share access with us for investigation