Exactly, but there are some exchanges that we must be considered as a safe exchange but not on storing your bitcoin in a long term. Safe for a short period of time because they had enough reputation build, safe because they had a SAFU offered, safe because they are widely accepted exchanges and has a large volume of traders. In this case, I will; consider this exchange is safe for a moment.

But if we are talking about storing bitcoin for how many years on an exchange, no way. I rather choose a bitcoin wallet that we have a key to or a hardware wallet where to store our bitcoin safe. That is a proper storing of bitcoin not on exchange. However, in my opinion, I will never trust this newly popular,  BlockFi or Celsius.