Ads and stbemu codes can be bought anywhere – on YouTube, Instagram, Facebook, TikTok and so on. The target audience of your project can be everywhere, but in different quantities.
For example, attracting subscribers from Youtube or TikTok for a channel about books will most likely not be as effective as from another telegram channel about books. Therefore, always start promoting a telegram channel from other channels in Telegram. On average, for most topics, the priority of sites for placement looks like this:
1. Telegram channels of similar and related topics
2. Telegram channels of other topics.
3. Targeting and seeding on Instagram
4. Other social networks and site placements.
So, there are sites, now you need advertising text for placement.