We definitely do not support unlimited RAW uploads, and we do recompress videos for streaming (at insanely high quality, though!). Stay tuned on RAW.
Additionally, we limit photos (JPEG, GIF, PNG) to 150MB or 210 Megapixels apiece, and videos to 20 minutes and 3GB. Those have continued to grow over time as additional devices demand them, and I expect that trend to continue.
[1] http://help.smugmug.com/customer/portal/articles/93278-what-...
So far the only real alternative I'm aware of is pics.io.
Which means we need to build something entirely new, which I'm happy to do, but we're currently in limbo and gathering feedback.
I'm mulling over implementing it myself, as a self-host solution. Probably aim for ingesting RAWs to DNGs, and have the possibility of losslessly doing some edit/transforms (store the operations outside the DNG files) -- along with export/view/cache as jpeg and jpeg 2000 for web browsing etc.
I suppose one would still need DNG/RAW if one want to keep the door open for being able to "re-develop from negative" on archived photos (jfr. archiving/keeping old negatives, which would be the equivalent for traditional photography).
Anyway, the site[1] might be of interest for those that find this thread interesting.
[1] http://www.dpbestflow.org/file-format/archive-file-formats