Yes. That's the whole point. They are doing research. Anthropic literally starts their description of the blackmail test observations saying that it is a test scenario using a fictional company.
> In another cluster of test scenarios, we asked Claude Opus 4 to act as an assistant at a fictional company
OpenAI, Google, etc. are not using "that strategy". I do believe that people at Anthropic genuinely care about AI safety. That's the main reason the company was founded. But I can imagine that idealism is eroding with new people and money flowing in.