I agree it is still reasonable.

But some examples of things that are profitable under the old regime, but maybe not at 20x the limit:

API services that consume media, whether to do some business logic specific thing or something specific, e.g. Transcriptions for videos, file conversion API, OCR API provider, etc.

If you try a video app without using WebRTC and peer traffic your bandwidth can blow up too. Even if you use something like push notifications with base64. There are lots of traps that use Bandwidth.