Stride, Inc. (formerly K12 Inc.) has thrived in the education market due to several key factors that set it apart from other unicorn-level players:

1. **Adaptability and Flexibility**: Stride has consistently evolved to meet changing demands in the education space, including the rise of online and hybrid learning models. It offers K-12 online education, career readiness programs, and adult education, making it adaptable to multiple markets.

2. **Diverse Offerings**: Unlike many competitors that focus solely on one segment, Stride covers various educational needs. It serves traditional K-12 students, adults, and those looking for career or technical education. This diversification has insulated the company from market downturns in specific segments.

3. **Longstanding Infrastructure**: Stride has built a strong technological and operational infrastructure over the years, allowing it to scale effectively. As one of the first movers in the online education space, it has had the time to fine-tune its platform and build a broad network of schools and educators.

4. **Strong Partnerships**: Stride has formed partnerships with schools, districts, and even corporate partners to expand its reach and credibility. These relationships have helped secure a continuous customer base, something that more niche or narrowly focused companies may lack.

5. **Pandemic Boost**: The COVID-19 pandemic accelerated the adoption of online education, and Stride was well-positioned to meet the sudden increase in demand. Many other players in the market were unprepared or unable to scale quickly, while Stride already had the experience and infrastructure in place.

6. **Regulatory Navigation**: Stride has been adept at navigating the regulatory landscape of online education. By maintaining accreditation and aligning with educational standards, it has managed to remain a trusted provider in the face of challenges.

7. **Focus on Outcomes**: Stride emphasizes student outcomes and career readiness, which appeals to both parents and students. This results-driven approach gives it a competitive edge over companies that may focus more on technology or features rather than actual educational impact.

These combined factors have allowed Stride to sustain growth and stability, whereas other players may have struggled due to lack of adaptability, scalability, or focus.