Is this also part of the outgoing transactions ^{[apart from the network fees]} or it's just limited to incoming ones?

If your platform is the one with the ".io" domain extension, then based on your privacy policy and TOS pages, the latter part isn't true!

Considering that network fees are constantly changing, I don't think it's a good idea to have static minimum deposit and withdrawal amounts.
^{e.g. when there's a huge backlog, it might lead to a user paying a ridiculous amount of fees to transfer an insignificant amount!}