Promotion methods have reached the national messenger. Now you can send invites to chats and send messages privately. Everything works just like on other platforms: you can compile a list of users (by phone numbers or IDs) or specify a link to other chats and start the process. When sending private messages, you can slightly modify and adapt the text. Honestly, I haven't noticed much benefit from this feature – the risk of getting banned remains regardless. Fortunately, the algorithms aren't so effective yet that they ban instantly (the key is not to overdo it and stick to reasonable limits), so you can work with one account for a long time. It's better not to use personal accounts for spam. Although they can be purchased here or elsewhere, it's not critical. I have no complaints about the quality of the service. It does its job, invites and messages get through. The effectiveness of the promotion method itself doesn't depend on this; it all depends on the target audience and content. Overall, I don't find this method particularly effective, but due to its low cost (the service is inexpensive), I still prefer to use it.