You said, "I should send back all my paychecks."
That would be a terrific gesture on your part.
The question by the OP was, "are the wills you find online (free) legit?" You did not answer the question seniorjudge. How many times have I heard a judge say, "just answer the question". In many cases (probably most) the online wills are "legit". The wills may, or may not, be appropriate for each person, however.