It is very important for your viewers to feel like they are part of your stream, because they are: the chat makes an important part of the dynamic of your stream, it is what makes it alive and it is sometimes creating some fun and creative moment.
Because of this, it is very important to thank your viewers and to show them your appreciation. Could it be because they’ve just followed your channel, but of course it may also be because they have just subscribed or renew a subscribe!
Even if a follow doesn’t seem much, add dozens or even hundreds of them and you start building a community, with people coming regularly to your stream.
It is crucial to not miss such events when they’re happening during your stream, and to mention it in your stream, because mentioning it may lead people not having done it yet, to do it themselves.
Would it be in a video game stream, a commentary stream or any kind of stream, don’t under-estimate thanking new members of your community the moment they start following or subscribing to your channel.