Vimeo videos are streamed directly from Vimeo, so if there’s a problem playing them it shouldn’t have anything to do with your Bubble plan.
It’s rare for Vimeo to have problems but it could be a problem on their side.
Or perhaps there’s an issue with the player you’re using.
Are your videos playing ok in Vimeo?
And what video player are you using in your bubble app?
Perhaps a link to your preview would also help so we can see exactly what’s happening.