Hello, I have an experience and software for growing up group with real members.
Delivery
The older the group the more members can be invited.
In most cases I will invite 500-1000 real members per day.
If group is too young fake members will join your group to minimize ban risk.
Inviting Service
You can choose target groups or usernames that you want to use as a source. I will invite those members to your group. I have my own bot that can scrape members from competitors groups. Also bot can filter members by their recent activity.
Notification removal
I will add bot which remove notifications that someone was invited to your group.
Price
30$ per 1k real members and 5$ for 1k fake members.
If you order more than 5k members - I will make discount to 25$ per 1k real members.
Note: some users may leave due to various reasons. So, its up to you and your content to keep members in your group. Also you should realize that I add members against their will - they can report about spam and group can be banned.
P.S.: If you have channel - telegram API don't allow to add real members to channels. Only fakes can join channels.
However, you can turn a group into a channel by muting people from messaging and making admin anonymous!
Feel free to contact me anytime.