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.
That's the only problem there especially if the government impose strict tracking for such activities.
But for other seeking for platform like this maybe they could try the recommendation given by this site
At the moment I don't use free streaming sites since don't have much time to watch the full game. I just watch the summary of the game provided by sports content creator and also seek more information about the result of the game.