So there is a distinction between running a ElasticSearch engine with custom changes in your backend and offering a ElasticSearch engine with custom changes to

So there is a distinction between running a ElasticSearch engine with custom changes in your backend and offering a ElasticSearch engine with custom changes to others as a backend? For a non-lawyer that seems very sketchy... I could understand that people would need some legal advice for that, to understand this stuff in detail...