For example, even in the US, courts have established that Twitter is a public forum with respect to what politicians (such as Trump) say IANAL but the court sa

For example, even in the US, courts have established that Twitter is a public forum with respect to what politicians (such as Trump) say IANAL but the court said Trump couldn't block you from his twitter account because his use of his feed made it a public forum. This was about Trump, not twitter. Twitter, AFAIK, wasn't forced to unblock the accounts trump had blocked.