2 of my customers explicitly asked for IPv6 prefixes. Another ISP had a couple of users actively using IPv6 15 years ago, but it bitrotted and nobody cared enough to ask for it to be fixed. Another user recently asked to be provided with IPv6 (actually, forcefully demanded it rater) and then didn't even bother to enable IPv6 on their router.

So, yeah, I don't see IPv6 being relevant as a small ISP today.