The crypto space is famous for Ponzi schemes, scams and promises that never turn into anything real, but as long as there are uneducated people willing to risk all their investment for another “get rick quick“ opportunity, someone will take advantage of them.
https://www.bafin.de/SharedDocs/Veroeffentlichungen/DE/Verbrauchermitteilung/unerlaubte/2021/meldung_210104_EXW-Wallet_Vivaexchange.html Updated link
Nexo and crypto.com are scams also for you ?
Have not used them. First impression of Nexo looks good, no idea about crypto.com