Can an OFL font stop being OFL and become a paid font?

Hello! Please help me make it clear to understand several question about license.

So I have two question:

1. Can an OFL font at some point cease to comply with the OFL license and become, for example, paid? Or is this license permanent?

2. If I understand correctly I can use free OFL fonts in my printing book in text, on cover and other typographic places? Also I can change letter-spacing, border and other fonts things in my book editor? And I am not required to provide information about the licensing or the author in my book pages?

All that I cannot do it sell OFL fonts and change it without renaming (?)

Do I understand correctly all of this position?
The legal text of the license was difficult for me because of non-native English, I apologize

Thank you in advance for your help!

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