Because a french computer, french games producers ported many of their games on those computers.
Thomson computers were know to have been used in some "cross common developpments" and ports for Amstrad CPC games.
As later MO6/TO8 models did include Video mode similar to Amstrad CPC's ones, in addition to a 16 colours character attributed mode (like on MSX1 or Spectrum...more like the MSX1 though...) and a 4096 colour palette.
Also the CPC getting CP/M compatibility was a definitive edge.
Thomsons also got their share of '''Speccy Ports'''.
=Exemples of games co-developped on Thomson and CPC=