On the internet, on social media or by phone, you can get offers to invest in "amazingly lucrative" schemes, by very insistent vendors. In recent years, it is often crypto currency investments marketed with the help of celebrities who have never been consulted and in fact completely disassociate themselves from the arrangement. Often it is very urgent before the "offer ends".
The best tip is: if an offer sounds too good to be true, then it probably is.
Serious companies that comply with the law are not allowed to advertise financial investments with overpraise and should always disclose the risks of investments. Scammers rarely do, which is another reason to hang up the phone or report the internet ad. Moreover, people who have been deceived by these fraudsters sometimes get calls from someone who claims to cooperate with Interpol and offers to track down the fraudsters, but is actually the same fraudster who wants to attract additional sums.
The arrangements on offer are completely made up and therefore incomprehensible. A good piece of advice is always to refrain from investing if you don't understand what it's all about. And a good tip is to check that the company has permission for its operations and is not on the Swedish Financial Supervisory Authority's warning list.