In 6.3, telemetry (‘phone home’) is an opt-in only feature for both the free and paid components of X-Pack. We won’t be tracking any identification, so even if users opt-in to telemetry, there is no way to turn that into a sales strategy.

Suing users is a pretty terrible business practice and not, at all, a funnel creation opportunity.

Re. License, there are a few FAQs on https://www.elastic.co/products/x-pack/open#faq that may help clear up any misunderstandings. Free features are free and governed by the Elastic EULA but are enabled by default. Paid features are available through an opt-in trial and, if they help solve a problem, can be purchased.

<disclaimer: I work at Elastic in Developer Relations>