In fact, a hot wallet or online wallet is very risky. Although they said that their wallet is highly secure, never trust them 100%. For, whatever the security, online wallet is still available to hack. However, if the user also keeps their important data online, or clicks the phishing site and others. This will rise up the risks.
If you are investing for long-term period, this is better to use a hardware wallet in order to decrease the risks of losing your assets.
I am also concerned that you may lose assets due to virus files that can hack the wallet application, so if you are using an online wallet, you should regularly scan the details of the anti-virus application settings to prevent virus files from being downloaded automatically when you are directed to the download link.
Exactly, many factors may influence the security of online wallets, viruses, malware, hack, or others that will lead someone else to get access to the wallet itself. There has been so many cases in which people lost their assets because using that kind of wallets.