It’s how you’re supposed to ride. You get ahead of the traffic at every possible opportunity because it’s safer that way.

We don’t have legally required bicycle tests but that motorcyclist is doing what they’re supposed to as well. While you probably wouldn’t want to be changing lanes quite as frequently on your test, you would fail the test if you sat in traffic rather than overtaking it where possible. If the traffic was speeding instead of stationary, you’d fail your test if you stuck to the speed limit regardless. If you leave the examiner behind, it’s their job to catch up to you.

They’re not cars and they’re not supposed to pretend that they are. The road rules are different and they’re intended to make bikes of all types less vulnerable to all the cars which might kill them by getting away from them as soon as possible.