Yes, it would. You are advertising your stream which is where the raffle is. That is spam/advertising and not allowed.
You have to follow the LFG rules regarding advertising.
Correct.
Spamming is not recommended. That is also actionable when reported. Many realms have people who get annoyed pretty fast with adverts if they are done too often.
Something else to be cautious of. If you require a sub or donation in Twitch in order to enter your “raffle” for a raid spot then you are engaging in real life money for in-game services. That can get the accounts involved suspended or banned.