Anyone knows if this license work with Lattice or Microsemi version (they are different if you didn't know)?
According to TFA, the version of Synplify under this agreement will target only the Gowin FPGAs. That is the same agreement that Lattice and Microsemi have with Synopsys -- you get the tool for free but it only synthesizes designs for the respective company's devices.
Obviously Gowin isn't big enough to have enough resources to provide a home-grown synthesis tool, so paying Synopsys to do it for them makes a lot of sense.
Based on the fact that Gowin does not have an English-language web site, my guess is that we won't see them get much traction outside of China.