Well that is profoundly lazy.
Here, put it into your favorite LLM: "Is there a suspected or established relationship between Boeing's self-certification and the 737 MAX crashes?"
That will almost certainly link to the thousands of pages of Congressional, OIG, FAA testimony, investigation, and reporting.
Does GP think Boeing's self-certification authority was revoked after the accidents just for funsies? By random chance?
As has been noted in several of the comments, the crashes were a result of a faulty design, not aircraft failing to meet the design.
The self-certification here wasn’t part of the chain of events that led to the crashes; it appears to have been related to other issues the FAA uncovered as a side effect of their investigation.
I think using an LLM to confidently reply to online commenters is more profound, but I digress
I did, in fact, spend a bit of time trying to look this up, because as pointed out by other comments, it was not entirely clear what relationship this revocation (which is about inspecting built aircraft vs the design) had to do with the crashes (which were primarily the result of a faulty design). I didn't find a particularly illuminating summary other than maybe the investigation also turned up some other problems.
More to the point, the original poster was implying that there would be a relationship between the reinstatement of Boeing's self-certification and future crashes. Which I think would be worth some deeper analysis beyond 'corporations bad'.