No-one seems to have sued Unity over an even more egregious set of EULA changes - claiming that users retroactively owed money on games developed and published under totally different terms.
Afaik, they rolled the retroactive fee back, right?
And technically, that was a modification of the future EULA.
If you wanted to continue to use Unity, here was the pricing structure, which includes payments for previous installs.
You were welcome to walk away and refuse the new EULA.
Which is a big difference with historically collecting data, in violation of the then-EULA, and attempting to retroactively bless it via future EULA change.