How to think that this was some mistake by Cloudflare, despite indicating that it is from the website.

I say this, because yesterday (the 15th) several websites received this information from Cloudflare.
Sites that are not connected to each other and are unlikely to use the same servers.

But for Cloudflare it is easier to point the finger at the sites than to assume some failure.

Update:
For a temporary period, B1exch exchange could not be used, but now there is no problem using b1exch and the site can be used easily. Those who were waiting to use the exchange can now use it easily if they wish.

It sounds I am dumbed by asking this but let's go 

Is the chat available at the b1exch.to site end-to-end encrypted?
I think it should be because the exchange itself is programmed for privacy, so it is or should be private not only for the founder, operational team to users with transactions but also with chat support messages.

Was the maintenance message manually written by the team? Or automatic because there was something wrong with the platform? I'm assuming the latter because they have not written anything on the "Updates" leftside panel, so could someone who used the site in the last 24h confirm that orders are being processed just fine?

I am not sure about the support chat feature provides by b1exch.to but it's non sense to speculate or create drama about it. The exchange representative has been actively in the forum so he will return to read posts, questions from community and give us replies as well as more information.

Who don't care about privacy actually have no reason to use b1exch.to so with an assumption that privacy is priority of b1exch.to users, they likely will care about how private their information in the chat is.

Meanwhile, I am positive about upcoming information from b1exch.to. 

Technically speaking, class and id attributes is commonly used in JS script for dom manipulation, b1exch don't use JS and only rely on server script like PHP (maybe), so i'll consider those class only for CSS and won't consider them as a proof for backend update through database update.

Usually everything is completed almost immediately after the deposit transaction is confirmed, it only takes a few minutes. At least that's what I had the experience of.
Also, it depends on which swap pair you did, it can also depend on how much liquidity is currently available,

💥 Attention friends, a new raffle has just been announced. Reserve your slot now and take part in the raffle.

Don’t wait too long — slots are limited.

     ✅ b1exch.to 👾 TRADE WARS 👾 $30 in BTC

 ➫ The winner will receive a prize of $30 in BTC 🎁
 ➫ Publish proof - for every $100 exchanged, you receive 1 slot.
 ➫ After selecting a block, we will use the BitList tool to determine the winner.

Good luck to all participants!

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Only b1exch representative on the forum can tell that but as far as I understand, the chat that's available on b1exch should have some kind of end-to-end encryption because it's a privacy service and we all know that such services try their best to achieve maximum level of privacy. If I'm not wrong they've removed other contact platforms because those weren't that safe but their on live chat is much safe. Still, I suggest you to use Tor as that's very important.