For those are asking about telegram chat, companies don't create live chat, they communicate with users through email and individual chat on their website because that give them full control and better reputation. ICOs have to go through public live chat because they raise money from investors, So there is a big different between a company and ICO project.
The majority of people want a transparent and public discussion, especially in telegram group.
When it's ICO project a transparent and public discussion is required because the target is investors ( people who invest their money in the project need to be in direct contact with the team, even if it's just a token they still own something in the project ).
When it's a company ( final service or product ) the target is customers (people who consume the company's service or product ), customers don't have the right like investors, therefore the company don't have to create any public live chat (ex telegram live chat ) or share information that are not relevant to customers.