Hidden pitfalls in .Net Open Source?

Interactive Week: “Seasoned open source code developers are concerned that an effort
to produce an open source alternative to Microsoft’s .Net development
platform may be held hostage by the software giant, if the endeavor
ever gets off the ground.

Open source critics of Microsoft said the company would have the
opportunity to strangle an open source project by demanding a
licensing fee and royalty payments each time an open source version of
its patent was implemented. They fear developers will flock to the new
initiative, code-named Project Mono, only to find themselves trapped
in payments to Microsoft later. A requirement for a volunteer developer
group to pay license fees or royalties would be enough to end many
open source projects, its advocates said.”