It might be a good idea to report the phishing domains to a phishing link database that was created/is owned by MetaMask. Once the link is flagged, even browsers like firefox, opera and chrome use the database and will put out a malicicious website warning as soon as some one tries to visit the link.
That's exactly right. This is definitely a good security measure. I just opened the domain link myself, and the warning message is already showing. This means that someone has already reported it to them, and they responded based on the evidence pointing to this swap's scam behavior.

It may also be a good idea to report the domain to the registrar and the hosting provider. If the website goes down, that would be better than just having a warning message, although this may also make them move to another domain.
That is why people are advised to research very well before picking an instant exchange, because a lot of them are scam platforms or data farms, or both.
That's right, and this is because scammers may create a fake exchange on more than one domain and promote it.
New platforms should always be treated with caution and with amounts you can afford to lose, especially if there is no evidence of their legitimacy.