This is not possible, as those services requires to know encryption keys of the client in order to serve/accept unencrypted data. No customer keys can be handled by SNOs.
What can be done is to increase costs for customers using S3/linksharing services, as they incur in more bandwidth.
Aside from that, the lower values of new payments I think will put in risk the viability of the project in long term, with an icnrease of the costs of living (which includes the electricity) of ~5-10% this year (at least in Europe) and also lets remember that hard drives are mechanical machines that fails at some point.
Also, as @agapitox mentioned, lowering too much the price paid to SNOs will make other options more appealing for SNOs.
I get the point, it is not viable in the mid/long term to be spending 13$ of STORJ tokens for each TB of egress used (without taking into account edge services), so some adjustments has to be made.