[pavel_lishin]

Any system can be abused.

I guess one way of combating this is that when you receive an invitation, ask your other coworkers if they received them as well, and ask them to participate. That way, at least the initial wrongdoer wouldn't be able to peg the salary to the person.

[A1kmm]

"Did you receive a SalaryShare link" is insufficient. I could send a different link to each co-worker. You would at least need to compare URLs.