Yes, this is right. Saying arbitrarily “better” leaves a lot out.

I must admit that using the business integration for customer support has lead me to really good experiences. Especially not having to call, wait 20 minutes under a ring tone, and talking over a line with very low sound quality.

I wished Whatsapp wasn’t a thing so much. There are so many so much better apps. Signal is so much better and it would work fine for the vast majority of people.

I think the oscillation described people’s activity time. Over the course of a day, people who would register for a VPN are much more likely to do so during the evening, because during the day they are busy with work. So you observer on a daily basis a peak like this.

Such charts are very common with services used daily. For example, social media usage in a given region often has a peak during the morning, a big peak during lunch time, and in general goes up after work time.

Of course not everyone works at the same time, but a majority of people have more or less the same work times, so we observe the peaks.