Thank you for reaching out, I hope you are doing well.
Video interstitials can be set to be skipped in the advanced options of your publishing campaign. Rewarded videos cannot, however these are triggered by the user himself and as such should not be an issue. Please refer to the screenshot below:
Although we have had a few questions regarding this, I would not say it is common. The best thing to do would be to reach out to Google to check with them.
I hope this helps, if not, please do not hesitate to reach out.