You have to take responsibility for your own security and take special precautions to stay safe. For instance type in the url and triple check it. Then save it to your bookmarks so you never make that mistake. Have a separate computer to make your transactions and do not do any other web surfing from that computer. Mostly simple stuff that is just inconvenient (but necessary)
Some very practical suggestions. I am using my smartphone only for crypto transactions (through apps for local exchanges ). I have also split the holdings in different exchanges to be safe. However, I completely agree with you regarding the use of another computer for these transactions especially if you are investing a large amount.