No, they blocked the UK because it was either that or open themselves up to £18m in fine liability thanks to the Online Safety Act[0]. Social media sites which are unable or unwilling to operate strict, full-time content moderation have all blocked the UK because the alternative is being held punitively liable for abuse by bad actors. Pretty much a no brainer. (And that's without even getting into the quagmire of legitimate, consenting, age-gated adult content.)
0: https://en.wikipedia.org/wiki/Online_Safety_Act_2023