Conferences are a little out of my specialty. People are experimenting with online conferences. Personally, I think this is a good idea, and I hope their experiments are successful. I think people here in the U.S. are open-minded about online conferences. I personally am giving some webinars next month. Going to online conferences is probably better than doing nothing, and if you learn something new and make new contacts then it could be a valuable experience.
Regarding the-science.com, I looked at their website, and there is not much content. I did not see any journals, and there sere lots of errors on the page. Regarding http://www.sci-pub.com, this was on my list, but I removed it. It’s borderline, and I don’t like to include borderline publishers on the list. Hope this helps.