I am a professor as several different schools in France (business, notarial studies, agricultural engineers, communication). I would day 95% of my students are from well-to-do families. But, most of them are required to find paid internships. The notary students usually get unpaid internships.

As an internship advisor, I can confirm one thing: paid or not, they put in the hours and take the same crap as a paid employee. Sometimes it is worse. For example, if an intern is absent from work, the message gets to me, and I send it up the chain of command and sometimes parents get involved. It is stressful for the students. My business students get paid internships (about €1400/month) but still need help from their parents and many of them will be doing something they don't really want to do (think finance instead of marketing).

Now, being a professor I am in contact with a rather large network of of profs spanning the private and public sector... My colleagues from the public sector are worried about this looming change to laws. It would lead to an overhaul of the system as the internship is counted as a credit. If it is decided that they should be paid, how many companies will want to pay when they can just hire a part-timer for the summer?