The main task of promoting a crypto project on forums
is to generate targeted traffic, build a loyal community and gain link mass. And if attracting new users is quite enough just to buy media advertising on the target areas, then for other tasks you will have to create an affiliate thread with the brand.
And this is where the first circle of hell begins.
Do not even try to create new threads without first reading the rules of the forum. If the thread is affiliated with a brand or if you offer a service - be kind enough to pay for the creation of a commercial topic. Otherwise, you will get banned. Fortunately, this is not the case everywhere. Smaller platforms allow you to post threads without additional fees. But on the largest forums the priority is to make money - so be prepared to pay for literally every possible action.
Here is an example: a popular forum about Internet marketing, Searchengines, with traffic of 760,000 users per month. All the commercial topics on copywriting, placing external links, and even the exchange of crypto are in the category "Exchange and sale". And you will be charged $250 for creating a thread for 6 months. Do you want to anchor a thread at the top of the category? Be kind for another $250 per month. Need to edit a published post more than 24 hours after publication? Another $75.