The Swedish and Finnish children’s services were presumably both significantly smaller and less well-established than GIDS?
GIDS had been billing itself as one of the top pioneering paediatric gender services in the world for decades (along with the Dutch Clinic, Kenneth Zucker’s Canadian clinic and Norman Spack in Boston - where Susie G took Jackie for blockers).
GIDS was a massive money spinner for the Tavi and Port trust, not only were they getting more GIDS budget from NHS England than they could spend (ending each financial year with a surplus because they couldn’t hire enough clinicians to use up the wages budget) but they were also using the fame of GIDS to get student bums on seats for the Tavis teaching courses.
The non-clinical CEO fella (I forgot his name) was bragging about it in the yearly reports. T&P even co produced the 3 part Channel 4 ‘Kids on the Edge’ series - it was supposed to be an ad to bring in more funds for the teaching and research parts of the institution but the 1/3 episodes that was about kids in the gender clinic added to the social contagion and thus the ever growing waiting lists (and thus the NHS England money increased too). GIDS also provided paediatric services for NHS Wales & NI and for the Irish health service.
TLDR, GIDS was just a bigger ship to turn around than the Paeds services in Sweden and Finland.
Sweden were the first to realise that the airing of TV shows that featured kids who identified as trans caused spikes in referral numbers, when they started airing the excellent Trans Train documentary series, referrals went down, so the social contagion aspect became obvious.
I believe all 4 parts of Trans Train are on YouTube with English subtitles.
Self ID has similarly proved easier to push through in small and/or sparsely populated countries. Lots of citizens = more chance that someone notices the legislation in the early stages and less chance of getting enough of the population on board.
Pretty sure Sweden has blocked Gender GP from doing business there (or perhaps that’s Norway? Off to check)
Edit: looks like GenderGP have been scuppered in Sweden, Finland AND Norway.