My country is Turkey and all these social media channels are accessible. If many people want to watch league matches illegally, the most used place is X (Twitter). When there are live bets, there can be more advertising and access through X. Many people are looking for live match broadcasts through X. Facebook and Instagram ads are also effective.
There are sites that you can visit and watch sport matches free but because those sites are illegally by law in your country, this practice contains risk for you too. I think if you are simply watching matches, you will not have too big possible troubles with governments.
If you visit those sites, watch matches and join their groups or platforms for bets, risk will be bigger. As if governments prohibited those things, including bets in your country, this practice is illegal from your side. I think government have their corresponding staffs to search, filter, and follow up those sites, and they can shut those sites down anytime as well as can find list of customers in those platform database or log data, and can find you in future.