I ran a thread for many years where I posted my bets and some useful tips for bettors.
(I won several competitions here on the forum).
https://bitcointalk.org/index.php?topic=1234109.0Topics with tips are always useful because they provide a point of view on betting and give very useful tips.
As main advice, ALWAYS avoid anyone who asks for money in exchange for betting tips. (and of course is not able to provide any proofs of expertise)
These offers are almost always scams.
Here on forum I have never seen anyone honest/reliable with that work.
What offers?
in these years I have seen the following types of scams on this topic (short summary):
- prediction on "generic" horse races (a horse with an "even" number will win one of the 8 races of this day

)
- rigged games in which they ask to send half of the winnings (only in case they win, obviously these are a scams...)
- a site that offered "predictions" odds but actually had a 70% chance of winning. When in doubt, they sent two opposing results and canceled one not winning.
and many many more... as reported before, anyone that ask for money and will provide betting tips is in 99% of the cases just a scammer.