I do indeed find it somewhat difficult to call something that people willingly apply for "forced labor". Forced labor is when the Taliban come to your village and force you to work under threat of shooting you and your entire family. I think you'll find very few people willing to volunteer for the Taliban option, while H1B applications were 9x oversubscribed in 2023.
The US could do a lot better when it comes to worker rights, don't get me wrong. But comparing a H1B worker to an actual slave has a very misguided vision to what slavery is, and how it continues to impact people around the world today.