All that I tried (Mega.nz, pCloud, OK.ru) provide both URL and Embed code. Sure there is a "restriction". To work the owner must set sharing for it so everybody can access (watch) it.
Here is an example for Mega.nz
Code:
<iframe width="640" height="360" frameborder="0" src="https://mega.nz/embed/ZohlVIaA#W7npwMi1OhOutxf3l3MCm_Rzz5Ko3nufNTypAp4JKd8" allowfullscreen ></iframe>
and here is the direct link for the same file:
mega.nz
Even if it appears as broken link, if you click it, you'll see that works.