seen today at my account:

hot take: I don't care as I am a bug reporter/reader. It does not pertain to me.
Some won't feel that way as copilot will vacuum up all the existing code for "training" from its users already using co-pilot.
Seems like a reasonable assumption those already using co-pilot knew their stuff was getting vacuumed up before this official announcement.
"Today, we’re announcing an update on how GitHub will use data to deliver more intelligent, context-aware coding assistance. From April 24 onward, interaction data—specifically inputs, outputs, code snippets, and associated context—from Copilot Free, Pro, and Pro+ users will be used to train and improve our AI models unless they opt out. "
Does not effect developers not using co-pilot or Pro, which, I imagine, are most of them. (?).
There is an opt-out for reporters like me and devs like you
It's incorporation seems minimal/non-alarming in scope to my eyes.