What about backblaze b2 with rclone, I'm sure there's a front end somewhere and with the clousflare cdn it's no egress cost. Or clousflares storage amounts
Its a business with a questionable legacy, and I have no idea what the longevity is of the service. Your data is probably fine, but it attracts a certain clientele that might put the service at risk long term of another seizure or whatever.
I also use Mega for big files, but not as my primary backup solution or anything important.