The hard cap is 25 million, have a look at page 32 of the WP. https://bidooh.io/whitepaper/whitepaper.pdf

Bidooh currently has 16 test screens in the UK and now operates 27 more screens in Bosnia and Herzezegovina, although there is more being installed! Please check out the details here: https://www.warc.com/newsandopinion/news/scfi_billboard_firm_targets_consumers_in_eastern_europe/41218

Don't forget the S Korea deal with 10,000 screens. https://medium.com/@bidooh.io/bidooh-wins-contract-to-roll-out-10-000-screens-across-south-korea-387dc5f5cee

Bidooh have made an incredibly fast move, making ads that are easy and not costly will make people interested in using them
sales that have exceeded the softcap, I think all tokens will be able to sell out later

How about periodicity of those Bidooh articles on Medium channel?
Or articles will be occasionally publish at specific timepoints when something important happen or achieve?

Hey there. There is no periodical time for these post yet.
But  when there are news or updates requiring an article, it will be updated.
Alternatively, you can join the telegram group.