Server / service downtime. For a well managed company, you would expect these to be almost uniformly green, meaning that all servers are responding correctly almost all of the time. This graph has a lot of yellow and red, indicating severe instability in their services.
Not being able to keep servers running is something that typically happens to smaller companies that grow too fast for them to manage. Established companies are (or, IMO, should be...) expected to have near perfect (>99.99%) uptime, and this is indicative of some expertise loss for the company broadly.