No leaks necessary; there are a number of open-source LLM's available:

https://github.com/Hannibal046/Awesome-LLM#open-llm

The key differentiator between these and proprietary offerings will always be the training data. Large amounts of high-quality data will be more difficult for an individual or a small team to source. If lawsuits like this one block ingestion of otherwise publicly-available data, we could have a future where copyright holders charge AI builders for access to their data. If that happens, "knowledge" could become exclusive to various AI platforms much the same way popular shows or movies are exclusive to streaming platforms.