jfbourdeau freeflarum.com seems gree but I guess there are some GB or number of users limitations ?
FreeFlarum's user limit is currently not enforced, but we reserve the right to cancel forums that are too big, e. g.: to the point that they endanger the stability of other FreeFlarum forums. In other words, you can have more users than the documentation states, if it doesn't affect other forums' performance. Please, see our Terms & Conditions for more information.
Or it's an unlimited Buffet and we are make donations ?
Donations only increase the amount of MBs you can store via FoF Upload attachments, among other perks. They do not allocate more resources to your forum or increase the (albeit rather arbitrary) user limit.
jfbourdeau Is there a way in FLarum to " Copy / paste " image in our posts.... Something that is bugging me with Flarum ( the only thing...)
FoF Upload should have a (similar, if not identical) functionality, but I am not 100 % sure, sorry...