Mailbox provides aliases for free, meaning emails of both myname@domain.com and theirname@domain.com will come to a single account.

You would need to buy another account in order to keep both of them separate.

By the way, Tor just updated their encryption. Now it’s using something called Counter Galois Onion.

Link

The ideal platform is Funkwhale, in my opinion. It is a part of the fediverse. Peertube is also a good option. Apart from it, you can find an aggregator, who can post your music on many platforms, some options are LANDR, CDBaby etc. But they charge some fees. I have published my music using Symphonic Distribution. I have registered as a record label there and have published music by many artists. Some aggregators also do that content ID thing on YouTube.