>You now have to pay $0.20 per install after your app has made $200,000 over the past year. ... Now you're still using open source, but still legally held to the terms of that license.

You can't retroactively pull an open source license ... whatever the new license is, if it forces you to pay, it no longer meets the definition of 'open source' [1]

[1]https://opensource.org/osd/