The real long term benefit is if using the service results in a better entry level position. A person starting a career developing on Win32 will have a significantly different career than someone starting a career in React Native. If Pathrise leads to an increase in job offers (quantity of offers) and an increase in the type of job offers (diversity of projects types) than they can be worth the 7% even if the initial pay is equal because it will give the recent grad more options in choosing their path.
There is a lack of job hunting skills among recent CS and CE students, and there is a potential customer base. If I were looking to invest in Pathrise I would specifically be interested in how they plan on targeting students that have tried and failed in the job market and filtering which students failed because of a lack of job hunting skills and which failed because of a lack of technical skills. Graduates they have tried and failed in the job market are the ones that should see the most benefit from this service.