Developers that have taken a proper Engineering degree and taken the exam, instead of calling themselves engineer, also know, because ethics is part of the process.

Now if they follow up on that, or decided other matters are more relevant for them, it is another matter.

Code of Ethics and Professional Conduct for Portuguese Engineering Order,

https://www.ordemdosengenheiros.pt/fotos/gca/blocks_items/co...

Similar document for Germany,

https://www.vdi.de/fileadmin/pages/mein_vdi/redakteure/publi...