Do not judge if we do not know the full terms and conditions related to the bonus. Every casino has their own terms about bonuses especially no deposit bonus. In this case we should know about the no deposit bonus which is taken by MNbag before judging the casino too far away without clear information.
What if he deposit a money on this site and turn into a scam? That bonus might be a click bait to attract more gambler but in reality they wont pay at all. I don't know, I just don't think an easy money like this will happen on a gambling site, not unless they really have this kind of promotion and it clearly says on their ToS. Don't be greedy, if you can't afford to deposit some money then that's ok, you can still have more bonusses on other site, there's a lot of options for this especially with a legit site that have a deposit bonus.
And what if the site is legit? We never know, even an old reputable site may turn into scam without any sign/notice. Come on dude, the problem in this case is not about the site is scam or not. It is about how to know how the bonus works, about the complete rules about the bonus. Before we take any bonus, we should read the whole terms. Once we take it, means we are accepting all the rules.
No site gives free bonuses, there are always wagering requirements for using or cashing out the bonus. What benefit the site will get if they only give a deposit bonus, without having the users to deposit their own money.
As far as the legality of the site is concerned, i would not deposit 1000 Euro on a site which i have not known before. I would prefer to read their feedback on the neutral sites before thinking to play there.