Probably most, but the issue is that most are phantom accounts. See, if you don’t have a Threads account and someone there searches for you, a phantom account is created, where you’ll receive notifications trying to persuade you to “create” tour Threads account. These accounts inflate the numbers, and its why Threads had such a ridiculously fast ““adoption”” rate
Don’t worry folks, if we all stop using plastic straws and take 30 second showers, we’ll be able to offset 5% of the carbon emissions this AI has!