If you need to promote a group on Vkontakte, vlike will be a good choice. Mostly, real people with genuine accounts work here. This is due to the fact that, despite its apparent simplicity, the service has quite strict rules for both work and withdrawing funds. For example, if your account has no photos, you simply won’t be paid the money you earned. The subscription prices are generally not much different from the offers of other similar services. I believe that it is most beneficial to use V-like in combination with other projects. In this case, the overall effectiveness of promoting the group increases. If you have serious intentions regarding your public page, it's better to make a large order for subscribers right away to get a small discount.
