Agreed, too many people loosely use betting to mean either casino gambling or sports betting and people that know this can sometimes find this to be a pain and people need to make an effort to distinguish the two by saying so explicitly.
Not everyone is able to distinguish between the two different types of gambling and often do not make an effort to show the differences between them. The irony is that all those who do not distinguish between them will be those who prefer slot games only because they can achieve a quick win and do not need to wait until the end of the matches in sports betting. Also, online games are diverse, and available at any time, unlike sports betting, which is determined by the dates of the tournaments.
Slot games, for example, are the most popular, although they may be the least profitable. The point is that users are ignorant of the basics of the game algorithms and always expect that the game providers are reliable, and this is enough for them to prefer them over sports betting or other online games such as roulette or dice.
For me I just think it's the fact that they feel they can make quick and fast bucks from slots game that most person hold on to, if there is one thing I know humans for it's for their lack of patience when it comes to something that would give them profits although it's not entirely everyone but a large percentage of human. Slots game provide easy asses to make cool cash and also a very fast and quick way to get addicted over normal sport betting but a whole mass of gamblers would prefer the latter.