There are two different issues at play here.
Unscrupulous Employees
The first issue concerns unscrupulous employees. They may have various reasons for not joining a company as planned, but I suspect in many cases it is purely monetary. They are solely motivated by how much money they can earn, not by performing the job. Employing such individuals would not be beneficial as they would lack productivity within the organization and constantly seek advancement opportunities.
Unscrupulous Employers
The second, more serious issue pertains to unscrupulous employers. A search of this forum will reveal numerous instances of individuals who joined a company only to desire leaving shortly after due to misrepresentation during the interview, poor management treatment, lack of training opportunities, unmet pay promises, burdensome leave policies, and absence of a clear path for advancement. This recurring problem prompts numerous posts each week from individuals seeking assistance.
Therefore, I urge you to cease blaming the candidates and instead examine your own organization. Evaluate the information provided to candidates. Are you transparent with them? How does your organization compare to others in the same industry? Is the compensation adequate? What is the career progression structure? What sets your organization apart, and why would someone choose to work for you?
As I have repeatedly emphasized on CiteHR, this issue will persist without a comprehensive and effective recruitment and selection process, supported by staff training. I can assert with certainty that most challenges in securing competent staff stem from this factor. My experience as a CiteHR member has revealed numerous recruitment practices that dismay me. Despite this, complaints regarding inadequate staff persist weekly. It is a perplexing situation.
While this issue likely occurs worldwide, I observe a higher prevalence in India. During my career, I was involved in the recruitment processes of three organizations. We experienced minimal attrition, and the recruited staff remained with us for extended periods. Although not flawless, we meticulously selected new staff and ensured their well-being.
Lastly, withholding original certificates until joining amounts to coercion in my view and fosters resentment. Candidates should steer clear of such employers as this behavior may indicate how they will treat employees in the future.