Very wise.
I keep a local download of the Git stuff that I need, and don’t allow it to update my working files. I have a script to do that.
I downloaded and installed platformio, looked at it briefly, thought (like you) ‘Hmm… yet another IDE to have to learn’; then continued with my old ways as there was stuff I needed to get on with. In the process, I ran my script to update my Git copy and there were errors all over the place - it seems that I’d told platformio to USE those as sources and instead it MOVED the directories, causing my script to fail. That’s the behaviour of malware, in my book. Platformio got deleted double-quick. Then I had a few hours restoring everything to their rightful places. 
I’ve managed to download the raw files now, but can’t do any more for a while.
[Edit]
Yep, as I suspected. The platformio files are byte-for-byte identical to the LowPowerLabs
SI7021.zip (3.1 KB)
If you then get an error about “ShowString”; here is what to do: Arduino IDE compilation errors