One possibility is increased monitoring. In the past, issues that happened weren't reported because they went under the radar. Whereas now, those same issues which only impact a small percentage of users would still result in a status update and postmortem. But take this with a grain of salt because it's just a theory and doesn't reflect any actual data.

A lot of people are pointing to AI vibe coding as the cause, but I think more often than not, incidents happen due to poor maintenance of legacy code. But I guess this may be changing soon as AI written code starts to become "legacy" faster than regular code.