Offload user uploads to cloud (S3 buckets)?

Hi,
my shared hosting bill is exploding some day because of all the screenshots people upload :) We're above 2GB as of today with 2 forums.
Does anyone here use S3 or another cheap cloud storage to offload user uploads?
I found this from 2016 where someone mounted S3 buckets into the local file system of the forum software: https://open.vanillaforums.com/discussion/comment/245402
I'm not sure if I have the privileges to set this up, yet, but aliasing the uploads folder to S3 would be ok for me.
Thanks for any hints!
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