Hi @crypto.piotr, I'll try to answer your questions the best way I can from my own understanding.

Disappearing comments - I don't know if the write word to use is disappearing, don't get me wrong, you see when I post and put the various tags, not just palnet but spt, leo, weed, sct and others that have UIs'. I open all of them in different browsers and notice the count for comments on Steemit (higher) is different from that of others which are mostly lower.

The point here is that it doesn't add up to what I have on Steemit.com, so it isn't a matter of it coming and then disappearing but rather that it didn't come at all. I am reasoning that it is only comments of users that have that particular token that are reflected or if it is members who comment on that particular platform shows up. Just guess on that one.

what actually does happen to rewards if I upvote post on Steemit published by someone, who doesn't have account on PALnet? - I think they still get their share of the 50% curation, I say this because I didn't buy any Sports token but have been curating members who have been earning it and for that I have been receiving my share of the curation, I only just staked them when I got over 200+ of the sports token.

Based on that and since they are all Steem-Engine tokens, I believe it should be the same for the PAL curation.

I don't think I am looking at just Palnet.io but rather on all the tokens Steem-Engine has given life to. I read most of their whitepaper, many of them have been waiting for SMT and even given up hope of their business coming into existence because SMT hasn't still manifested.

Steem-Engine has given live to all of this in a very short time and I am willing to be patient with them solving the issues that come up with developments such as they have done.

Speempeak is also doing a lot of integration of all these new stuff we are seeing into their UI.

We should remember that all these developments are within a short period of about 4 months.

Thanks.