Thanks for making this in the first place! I saw IronCalc in the list of projects supported by NLnet and it grabbed my attention.
By the way, if You don't mind me asking, how'd Tuta end up sponsoring IronCalc? It seems that lately they and Proton have been trying to expand their business away from just email. The fact that Tuta is interested in IronCalc makes me think they want to have an office-like offering.