> go back and ask your teachers what they felt they owe people asking them to design things unpaid, in their free time
As an engineer, your first duty is to protect the public, then your client, then your employer. You have that duty to the public regardless of whether you're being paid by a client or not, because it comes from practicing engineering, not from remuneration.
As an engineer, your first duty is to protect the public, then your client, then your employer. You have that duty to the public regardless of whether you're being paid by a client or not, because it comes from practicing engineering, not from remuneration.