All online wallets in my opinion are safe, I have also used an online wallet for a long time and have never experienced any problems, a secure wallet all depends on you in managing it and maintaining a password or private key.
Do you know that not all online wallet are decentralized, sometimes centralized like xapo, etc which we must register using email. This also an online wallet but not secure. So I think all wallets which we keep the private key are safe, not all online wallets