Most of the work done by illegal immigrants is for things like Deliveroo/Uber Eats, where an account is shared:
Somebody has put together a list of H1B jobs that have been advertised to confirm that a US-person couldn't do the role.
Some of the roles look legit, some look entry level and require you to physically post your CV to apply.
You can see the list here: https://www.jobs.now/
There is a website called jobs.now which has collated all of the H1B jobs that get (quietly) advertised to so that companies can demonstrate that no suitable US person can do the job.
Some are legitimately highly skilled, but you also see jobs like:
https://www.jobs.now/jobs/164577823-lead-software-engineer
>>Develop and implement next generation Human Capital Management (HCM) software.
>>Requirements:
>>Bachelor's degree or foreign equivalent in Computer Science, Informatics, Computer Engineering or related field
>>2 years experience in software development
>>Develop and implement HCM software solutions for global enterprise
>>Create applications on cloud platforms
>>Work with Golang and NodeJS
>>Participate in full product cycle from wireframes and database models to UI/UX development
>>Home telecommute available
>>Application Instructions: Send CV to: LS, EPI-USE America, Inc. 303 Perimeter Ctr N., Ste 300 Atlanta, GA 30346
When was the last time you had to post a CV to apply for a job? This blatantly designed to ensure no US person applies (and if anyone in the US is qualified and wants to apply to stop the visa abuse, please do).