Mega is usually more reliable in not having false positives that cause files to be randomly removed, though the 5GB per 5 hours limit is an issue. Sadly getting around that is tricky. Standard compression (even the high highest compression option in winrar or zipping are negligible in that it will not shave off the full 100MB in size over the limit.
Other tools that use modified versions of zlib, oodle, zstd can do it, but then it would annoy people with a package that takes 10+ minutes on an 8 core CPU to extract depending on the level of compression. Though it is awesome if you want to archive a bunch of files, e.g., adding around 150+GB of mods to a single player game, and when the load order and everything else is set just right to not have anything break, you archive that using some of those custom libraries that brings the size down to around 40-50GB, knowing that the next time you want to extract it, it will take around 2 hours.