Why is that weird? Attorneys in this are working on behalf of the US Government. If they feel like settling gets the best deal for the government, then they do that.
Settling has nothing to do with a finding of truth.
On the same token, it's doubtful that the SEC would proceed to charge Robinhood if they knew they couldn't make the case stick in court.
What they do reminds me way too much of https://digitalcommons.law.yale.edu/fss_papers/543/