A referral link you can get in any casino i think. But it is a way for different "review" sites. They can post links to different casinos. The problem here that lots of peoples copy-paste reviews and don`t matter about casino quality. They get some profit and don`t cares the security of the referrals. Someone, for recommend just one casino looks more fair.

An influencer somehow has many people who are his followers and they will always go where the influencer goes, but to hire an influencer you need a lot of money, some casinos do not have that money, they have to do other types of advertising, such as contests , promotions, there are casinos that are choosing to promote soccer teams and that when the matches are there, their advertising can be seen everywhere, that is a good way to advertise, but an influencer is a lot of money.

I have seen many times in my life how influential people or very famous movie artists advertise this or that product service. 
I think this method of attracting famous people is very effective in terms of advertising a particular casino.  But any influential person always has a manager who will definitely start haggling about the amount of the fee for the participation of this famous person in advertising.  As a result, it will still not be possible to make such an advertising campaign cheap. 

But, I repeat, this method of casino advertising will certainly be very effective.

I think that all such referrers try all the ways to promote their referral link. But i don`t sure that the "social" links would be profitable than "review" site. I think that social links can`t promote several casinos - it seems strange that someone uses several casinos the same time and think that all of them are wonderful.

Those who run affiliate marketing websites and provide sites with referral links for others to join, can't go with just one link or one platform as they need to provide multiple options for everyone to choose from, and that is a good strategy considering the different preferences people usually have.

Some people might not like the single casino one is promoting, so they will lose a potential referral this way, but if they have more options available, the person will look for other options and might join one of the platforms under them, so which earns them a referral which they possibly could lose if they didn't have different varieties. So that is the basic reason why people review many different casinos and provide affiliate links to all of them.

There are many sites that don't have good reviews from gambler itself but they are using AI for thier good reviews but they don't mind thier services if they are worthy to be given a good trust and good review and that's why we the gamblers who want to play in their sites we need to know more about thier sites. And also we need to see thier review fin They are telling the truth about thier review and other thing is that we can thier services into small amount.

The advice would be quite generic: what are exactly your strengths and how do you intend to generate leads to the casinos that would use your services? Are you a big infliencer that can bring thousands of hits on a bespoke fashion or are you just looking for a "click here" quick campaign with no frills and thrills that potentially anyone could join without experience?

This is the common way of promoting thier sites or casino nowadays especially in our country the owner of the casino used the known person or like we say, bloggers and streamers to promote thier games and use thier referral and like you said above that's true that every person you invited and make some deposit then you have your own percentage which is very nice and good strategy when the owner of the casino uses very known people. Because the number of followers and once they saw that it's easy win then for sure they will try and play with the casino.

The most part of these systems works the same way. The referrer gets bonus for deposit and for the bets of the referral. When the referrer takes responsibility for his recommendation i don`t see any problem - he makes total research of the casino and the referrals can feel themselves safety. In the other way the referrer will get awful feedback and lose his reputation.

Well, I'm not sure if you don't realize this but partnering up with a soccer team is also a costly thing that not every casino can afford to do. Casinos like Stake.com or 1xbet have partnered up with soccer teams to use their players and their names in marketing campaigns while the teams will have their logos on their kits displayed in the stadium during matches.

It's a great marketing technique for both sides but it of course isn't cheap for the casino, although they get what they desire which is a larger audience since we all know how popular soccer teams are and their influence is way more than just a social media influencer that charges money to write a post about the casino.