Application Max Size (GB)?

Is there a published or theoretical maximum application size?

I understand that Oracle recommends best practice to use OCI Object Storage for attachments; however, users are reluctant to implement object storage and would prefer to continue storing attachments in the app. Current snapshot is 142GB; attachments size 105GB; annual growth ~30GB/year.

At what point are we likely to encounter issues (other than slowness of backup/restore) due to application size?

Thanks!