They are, but SpaceX is trying to get rules changed. They want the index to buy at a multiple of the float, so they release say 5% but get bought as if they had released 15% float. They also normally wouldn't be eligible for index inclusion for ~1 year, after showing multiple quarters of good stewardship, etc. They're trying to bypass all that

Yes, the MSCI World and FTSE World that many broad ETFs and funds track are float weighted.

Matt Levine wrote (uh, yesterday?) that the Nasdaq 100 was adding it (not a full linear weighting....) right now to accommodate this scam.