Oh i think its always best when they allow for altcoin investments and not just the big 2-3. Even if they have to use a third party convertor that accepts altcoins and they get btc/eth, being able to invest third party coins that we have in a project is a great incentive for buyers.
That's a great idea many altcoins now have great potential and some of it is good to be allowed to invest in and I'm pretty sure Neuroneum will do that or exceed that kind of idea.