There are numerous examples of community developed software where they simply add something along "Professional support available for corporate use", without the inevitable negative impact of "supported by volunteers and intended for individual use". They could make money without ruining the product's perception, but apparently they don't care.

From their page at https://www.libreoffice.org/get-help/professional-support/

"The Document Foundation does not provide professional support services for LibreOffice. It does, however, develop and maintain a certification system for professionals of various kinds who deliver and sell services around LibreOffice."

There is where the problem lies, and where they should do something. Don't touch the product, just build a business around it.