Just to verify. Yes, indeed it is okay to wire up a pizoelectric speaker directly to the 3.3 V GPIO pins, PWM for best results. Use a small one, though, if you don’t want it to be too loud.
20180116/DuckDuckGo raspberry pi zero pizoelectric one-bit speaker
20180116/https://raspberrypi.stackexchange.com/questions/38758/alsa-piezo-buzzer-directly-on-pwm-pin
20180116/https://www.reddit.com/r/raspberry_pi/comments/2e0v7d/how_do_i_connect_a_piezo_speaker_to_the_raspberry/
20180116/https://www.adafruit.com/product/160?gclid=CjwKEAjwpcGfBRDni__JqrTIqx4SJAB9BpSO5n34p42eNieFX4nD4vhMcc5rEWIfS2PtiKKwPUAb1RoCQu3w_wcB
Wait, CodePlex is being shut down??? Yes, GitHub is the cited successor. How well is GitHub actually doing in their financials? They seem to be doing somewhat well.
20180116/https://blogs.msdn.microsoft.com/bharry/2017/03/31/shutting-down-codeplex/
20180116/https://en.wikipedia.org/wiki/GitHub
20180116/https://medium.com/@moritzplassnig/github-is-doing-much-better-than-bloomberg-thinks-here-is-why-a4580b249044
Interesting. In case you are wondering about this “Medium” website, social journalism, the response to declining revenues in traditional journalism.
20180116/https://en.wikipedia.org/wiki/Medium_(website)
20180116/https://en.wikipedia.org/wiki/Social_journalism
20180116/https://en.wikipedia.org/wiki/Journalism
20180116/https://en.wikipedia.org/wiki/Citizen_journalism