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The difference is that Mono knowingly infringes MS patants, while it is not clear if the projects you mentioned do infringe MS patents.
It is not a too big difference. IMHO the M$ never will sue the mono project directly (and specially not the ECMA standard part of mono), because it is not too good advertisement for the company. Probably the M$ can kill any linux projects, but IMHO M$ doesn't want SCO-like repute. The small marionett-companies, like SCO IMHO far more dangerous for linux, but this companies can't sue the mono (or not more then any other project).