I didn't pull it out of thin air. Both articles (Sorry, no links) said they were lawyers. You know lawyers do disagree. I am not giving bad advice. I am just repeating what I have read or was told.

There are different terms.
Substantial Gainful Work
Substantial Gainful Activity
Maybe Substantial Gainful Income (That is more ssi, not ssdi)

They can change the rules after you are disabled but if you are grandfather in. They have to go by the old rules. In my sons case, they have to go by the old rules. Otherwise, he wouldn't be getting SSDI.

A lawyer really needs to find out if Social Security Change it from Substantial Gainful Work to Substantial Gainful Activity. If they didn't. There is a good chance for a class action lawsuit.

There is another option. You take classes at home on a computer, that shouldn't be considered Substantial Gainful Activity.